diff --git a/core/core.api.php b/core/core.api.php
index cfb8800728..087b80aacf 100644
--- a/core/core.api.php
+++ b/core/core.api.php
@@ -762,7 +762,7 @@
  * A typical service definition in a *.services.yml file looks like this:
  * @code
  * path.alias_manager:
- *   class: Drupal\Core\Path\AliasManager
+ *   class: Drupal\path\AliasManager
  *   arguments: ['@path.crud', '@path.alias_whitelist', '@language_manager']
  * @endcode
  * Some services use other services as factories; a typical service definition
diff --git a/core/core.services.yml b/core/core.services.yml
index 1cddf59cfe..93f7e76c88 100644
--- a/core/core.services.yml
+++ b/core/core.services.yml
@@ -454,14 +454,6 @@ services:
   queue.database:
     class: Drupal\Core\Queue\QueueDatabaseFactory
     arguments: ['@database']
-  path.alias_whitelist:
-    class: Drupal\Core\Path\AliasWhitelist
-    tags:
-      - { name: needs_destruction }
-    arguments: [path_alias_whitelist, '@cache.bootstrap', '@lock', '@state', '@path.alias_storage']
-  path.alias_manager:
-    class: Drupal\Core\Path\AliasManager
-    arguments: ['@path.alias_storage', '@path.alias_whitelist', '@language_manager', '@cache.data']
   path.current:
     class: Drupal\Core\Path\CurrentPathStack
     arguments: ['@request_stack']
@@ -1209,11 +1201,6 @@ services:
     arguments: ['@maintenance_mode', '@config.factory', '@string_translation', '@url_generator', '@current_user', '@bare_html_page_renderer', '@messenger']
     tags:
       - { name: event_subscriber }
-  path_subscriber:
-    class: Drupal\Core\EventSubscriber\PathSubscriber
-    tags:
-      - { name: event_subscriber }
-    arguments: ['@path.alias_manager', '@path.current']
   route_access_response_subscriber:
     class: Drupal\Core\EventSubscriber\RouteAccessResponseSubscriber
     tags:
@@ -1339,12 +1326,6 @@ services:
     arguments: ['@current_route_match']
     tags:
       - { name: route_processor_outbound, priority: 200 }
-  path_processor_alias:
-    class: Drupal\Core\PathProcessor\PathProcessorAlias
-    tags:
-      - { name: path_processor_inbound, priority: 100 }
-      - { name: path_processor_outbound, priority: 300 }
-    arguments: ['@path.alias_manager']
   route_processor_csrf:
     class: Drupal\Core\Access\RouteProcessorCsrf
     tags:
diff --git a/core/lib/Drupal/Core/Path/AliasStorage.php b/core/lib/Drupal/Core/Path/AliasStorage.php
index 7de344a781..8ec388d28a 100644
--- a/core/lib/Drupal/Core/Path/AliasStorage.php
+++ b/core/lib/Drupal/Core/Path/AliasStorage.php
@@ -73,7 +73,7 @@ public function save($source, $alias, $langcode = LanguageInterface::LANGCODE_NO
     }
 
     if ($pid) {
-      /** @var \Drupal\Core\Path\PathAliasInterface $path_alias */
+      /** @var \Drupal\path\PathAliasInterface $path_alias */
       $path_alias = $this->getPathAliasEntityStorage()->load($pid);
       $original_values = [
         'source' => $path_alias->getPath(),
@@ -133,7 +133,7 @@ public function load($conditions) {
       ->execute();
     $entities = $this->getPathAliasEntityStorage()->loadMultiple($result);
 
-    /** @var \Drupal\Core\Path\PathAliasInterface $path_alias */
+    /** @var \Drupal\path\PathAliasInterface $path_alias */
     $path_alias = reset($entities);
     if ($path_alias) {
       return [
diff --git a/core/lib/Drupal/Core/Routing/RouteProvider.php b/core/lib/Drupal/Core/Routing/RouteProvider.php
index d31f293e18..1df331b894 100644
--- a/core/lib/Drupal/Core/Routing/RouteProvider.php
+++ b/core/lib/Drupal/Core/Routing/RouteProvider.php
@@ -467,8 +467,8 @@ protected function getRouteCollectionCacheId(Request $request) {
    */
   protected function getCurrentLanguageCacheIdPart() {
     // This must be in sync with the language logic in
-    // \Drupal\Core\PathProcessor\PathProcessorAlias::processInbound() and
-    // \Drupal\Core\Path\AliasManager::getPathByAlias().
+    // \Drupal\path\PathProcessor\AliasPathProcessor::processInbound() and
+    // \Drupal\path\AliasManager::getPathByAlias().
     // @todo Update this if necessary in https://www.drupal.org/node/1125428.
     return $this->languageManager->getCurrentLanguage(LanguageInterface::TYPE_URL)->getId();
   }
diff --git a/core/modules/block/tests/src/Kernel/Migrate/d6/MigrateBlockContentTranslationTest.php b/core/modules/block/tests/src/Kernel/Migrate/d6/MigrateBlockContentTranslationTest.php
index db255d79f8..273604c953 100644
--- a/core/modules/block/tests/src/Kernel/Migrate/d6/MigrateBlockContentTranslationTest.php
+++ b/core/modules/block/tests/src/Kernel/Migrate/d6/MigrateBlockContentTranslationTest.php
@@ -24,6 +24,7 @@ class MigrateBlockContentTranslationTest extends MigrateDrupal6TestBase {
     'block_content',
     'content_translation',
     'language',
+    'path',
     'statistics',
     'taxonomy',
     // Required for translation migrations.
diff --git a/core/modules/block/tests/src/Kernel/Migrate/d6/MigrateBlockTest.php b/core/modules/block/tests/src/Kernel/Migrate/d6/MigrateBlockTest.php
index 6ea998b0c9..99e2d75a7a 100644
--- a/core/modules/block/tests/src/Kernel/Migrate/d6/MigrateBlockTest.php
+++ b/core/modules/block/tests/src/Kernel/Migrate/d6/MigrateBlockTest.php
@@ -26,6 +26,7 @@ class MigrateBlockTest extends MigrateDrupal6TestBase {
     'aggregator',
     'book',
     'forum',
+    'path',
     'statistics',
   ];
 
diff --git a/core/modules/block/tests/src/Kernel/Migrate/d7/MigrateBlockContentTranslationTest.php b/core/modules/block/tests/src/Kernel/Migrate/d7/MigrateBlockContentTranslationTest.php
index 3201d02b16..45ac639159 100644
--- a/core/modules/block/tests/src/Kernel/Migrate/d7/MigrateBlockContentTranslationTest.php
+++ b/core/modules/block/tests/src/Kernel/Migrate/d7/MigrateBlockContentTranslationTest.php
@@ -28,6 +28,7 @@ class MigrateBlockContentTranslationTest extends MigrateDrupal7TestBase {
     'config_translation',
     'content_translation',
     'language',
+    'path',
     'statistics',
     'taxonomy',
     // Required for translation migrations.
diff --git a/core/modules/block/tests/src/Kernel/Migrate/d7/MigrateBlockTest.php b/core/modules/block/tests/src/Kernel/Migrate/d7/MigrateBlockTest.php
index 929854165a..dbcc810bd5 100644
--- a/core/modules/block/tests/src/Kernel/Migrate/d7/MigrateBlockTest.php
+++ b/core/modules/block/tests/src/Kernel/Migrate/d7/MigrateBlockTest.php
@@ -25,6 +25,7 @@ class MigrateBlockTest extends MigrateDrupal7TestBase {
     'node',
     'text',
     'filter',
+    'path',
     'user',
   ];
 
diff --git a/core/modules/jsonapi/tests/src/Functional/PathAliasTest.php b/core/modules/jsonapi/tests/src/Functional/PathAliasTest.php
index 873cb2abad..f3aecaacd5 100644
--- a/core/modules/jsonapi/tests/src/Functional/PathAliasTest.php
+++ b/core/modules/jsonapi/tests/src/Functional/PathAliasTest.php
@@ -2,7 +2,7 @@
 
 namespace Drupal\Tests\jsonapi\Functional;
 
-use Drupal\Core\Path\Entity\PathAlias;
+use Drupal\path\Entity\PathAlias;
 use Drupal\Core\Url;
 
 /**
diff --git a/core/modules/menu_link_content/menu_link_content.module b/core/modules/menu_link_content/menu_link_content.module
index 48dafd76d3..27c9e68c0e 100644
--- a/core/modules/menu_link_content/menu_link_content.module
+++ b/core/modules/menu_link_content/menu_link_content.module
@@ -7,7 +7,7 @@
 
 use Drupal\Core\Url;
 use Drupal\Core\Entity\EntityInterface;
-use Drupal\Core\Path\PathAliasInterface;
+use Drupal\path\PathAliasInterface;
 use Drupal\Core\Routing\RouteMatchInterface;
 use Drupal\system\MenuInterface;
 
diff --git a/core/modules/menu_link_content/tests/src/Kernel/PathAliasMenuLinkContentTest.php b/core/modules/menu_link_content/tests/src/Kernel/PathAliasMenuLinkContentTest.php
index c0cdba31b8..4f13b9c068 100644
--- a/core/modules/menu_link_content/tests/src/Kernel/PathAliasMenuLinkContentTest.php
+++ b/core/modules/menu_link_content/tests/src/Kernel/PathAliasMenuLinkContentTest.php
@@ -18,7 +18,7 @@ class PathAliasMenuLinkContentTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['menu_link_content', 'system', 'link', 'test_page_test', 'user'];
+  public static $modules = ['menu_link_content', 'system', 'link', 'path', 'test_page_test', 'user'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/path/path.info.yml b/core/modules/path/path.info.yml
index ba2c759c99..1713e7bb53 100644
--- a/core/modules/path/path.info.yml
+++ b/core/modules/path/path.info.yml
@@ -4,4 +4,5 @@ description: 'Allows users to rename URLs.'
 package: Core
 version: VERSION
 core: 8.x
+required: true
 configure: path.admin_overview
diff --git a/core/modules/path/path.module b/core/modules/path/path.module
index f344c74b6e..71afb4ec99 100644
--- a/core/modules/path/path.module
+++ b/core/modules/path/path.module
@@ -5,11 +5,12 @@
  * Enables users to rename URLs.
  */
 
-use Drupal\Core\Url;
 use Drupal\Core\Entity\ContentEntityInterface;
 use Drupal\Core\Entity\EntityTypeInterface;
 use Drupal\Core\Field\BaseFieldDefinition;
 use Drupal\Core\Routing\RouteMatchInterface;
+use Drupal\Core\Url;
+use Drupal\path\Form\SystemInformationFormAlter;
 
 /**
  * Implements hook_help().
@@ -69,3 +70,12 @@ function path_entity_translation_create(ContentEntityInterface $translation) {
     }
   }
 }
+
+/**
+ * Implements hook_form_FORM_ID_alter().
+ */
+function path_form_system_site_information_settings_alter(array &$form) {
+  Drupal::classResolver()
+    ->getInstanceFromDefinition(SystemInformationFormAlter::class)
+    ->alterForm($form);
+}
diff --git a/core/modules/path/path.services.yml b/core/modules/path/path.services.yml
new file mode 100644
index 0000000000..bf34794392
--- /dev/null
+++ b/core/modules/path/path.services.yml
@@ -0,0 +1,22 @@
+services:
+  path.alias_whitelist:
+    class: Drupal\path\AliasWhitelist
+    tags:
+      - { name: needs_destruction }
+    arguments: [path_alias_whitelist, '@cache.bootstrap', '@lock', '@state', '@path.alias_storage']
+  path.alias_manager:
+    class: Drupal\path\AliasManager
+    arguments: ['@path.alias_storage', '@path.alias_whitelist', '@language_manager', '@cache.data']
+
+  path.alias_subscriber:
+    class: Drupal\path\EventSubscriber\PathAliasSubscriber
+    tags:
+      - { name: event_subscriber }
+    arguments: ['@path.alias_manager', '@path.current']
+
+  path_processor_alias:
+    class: Drupal\path\PathProcessor\AliasPathProcessor
+    tags:
+      - { name: path_processor_inbound, priority: 100 }
+      - { name: path_processor_outbound, priority: 300 }
+    arguments: ['@path.alias_manager']
diff --git a/core/lib/Drupal/Core/Path/AliasManager.php b/core/modules/path/src/AliasManager.php
similarity index 98%
rename from core/lib/Drupal/Core/Path/AliasManager.php
rename to core/modules/path/src/AliasManager.php
index 39472797ad..6731a314c1 100644
--- a/core/lib/Drupal/Core/Path/AliasManager.php
+++ b/core/modules/path/src/AliasManager.php
@@ -1,11 +1,12 @@
 <?php
 
-namespace Drupal\Core\Path;
+namespace Drupal\path;
 
 use Drupal\Core\Cache\CacheBackendInterface;
 use Drupal\Core\CacheDecorator\CacheDecoratorInterface;
 use Drupal\Core\Language\LanguageInterface;
 use Drupal\Core\Language\LanguageManagerInterface;
+use Drupal\Core\Path\AliasStorageInterface;
 
 /**
  * The default alias manager implementation.
@@ -64,7 +65,7 @@ class AliasManager implements AliasManagerInterface, CacheDecoratorInterface {
   /**
    * Holds the array of whitelisted path aliases.
    *
-   * @var \Drupal\Core\Path\AliasWhitelistInterface
+   * @var \Drupal\path\AliasWhitelistInterface
    */
   protected $whitelist;
 
@@ -97,7 +98,7 @@ class AliasManager implements AliasManagerInterface, CacheDecoratorInterface {
    *
    * @param \Drupal\Core\Path\AliasStorageInterface $storage
    *   The alias storage service.
-   * @param \Drupal\Core\Path\AliasWhitelistInterface $whitelist
+   * @param \Drupal\path\AliasWhitelistInterface $whitelist
    *   The whitelist implementation to use.
    * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
    *   The language manager.
diff --git a/core/lib/Drupal/Core/Path/AliasManagerInterface.php b/core/modules/path/src/AliasManagerInterface.php
similarity index 97%
rename from core/lib/Drupal/Core/Path/AliasManagerInterface.php
rename to core/modules/path/src/AliasManagerInterface.php
index a3096fc64f..1070d5b66c 100644
--- a/core/lib/Drupal/Core/Path/AliasManagerInterface.php
+++ b/core/modules/path/src/AliasManagerInterface.php
@@ -1,6 +1,6 @@
 <?php
 
-namespace Drupal\Core\Path;
+namespace Drupal\path;
 
 /**
  * Find an alias for a path and vice versa.
diff --git a/core/lib/Drupal/Core/Path/AliasWhitelist.php b/core/modules/path/src/AliasWhitelist.php
similarity index 98%
rename from core/lib/Drupal/Core/Path/AliasWhitelist.php
rename to core/modules/path/src/AliasWhitelist.php
index 9286c955b8..9e5c2534fe 100644
--- a/core/lib/Drupal/Core/Path/AliasWhitelist.php
+++ b/core/modules/path/src/AliasWhitelist.php
@@ -1,9 +1,10 @@
 <?php
 
-namespace Drupal\Core\Path;
+namespace Drupal\path;
 
 use Drupal\Core\Cache\CacheBackendInterface;
 use Drupal\Core\Cache\CacheCollector;
+use Drupal\Core\Path\AliasStorageInterface;
 use Drupal\Core\State\StateInterface;
 use Drupal\Core\Lock\LockBackendInterface;
 
diff --git a/core/lib/Drupal/Core/Path/AliasWhitelistInterface.php b/core/modules/path/src/AliasWhitelistInterface.php
similarity index 94%
rename from core/lib/Drupal/Core/Path/AliasWhitelistInterface.php
rename to core/modules/path/src/AliasWhitelistInterface.php
index ca2cf6300e..3f884d2bb1 100644
--- a/core/lib/Drupal/Core/Path/AliasWhitelistInterface.php
+++ b/core/modules/path/src/AliasWhitelistInterface.php
@@ -1,6 +1,6 @@
 <?php
 
-namespace Drupal\Core\Path;
+namespace Drupal\path;
 
 use Drupal\Core\Cache\CacheCollectorInterface;
 
diff --git a/core/modules/path/src/Controller/PathController.php b/core/modules/path/src/Controller/PathController.php
index 6db3db647a..cb10175046 100644
--- a/core/modules/path/src/Controller/PathController.php
+++ b/core/modules/path/src/Controller/PathController.php
@@ -6,7 +6,7 @@
 use Drupal\Core\Controller\ControllerBase;
 use Drupal\Core\Link;
 use Drupal\Core\Path\AliasStorageInterface;
-use Drupal\Core\Path\AliasManagerInterface;
+use Drupal\path\AliasManagerInterface;
 use Drupal\Core\Url;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\HttpFoundation\Request;
@@ -26,7 +26,7 @@ class PathController extends ControllerBase {
   /**
    * The path alias manager.
    *
-   * @var \Drupal\Core\Path\AliasManagerInterface
+   * @var \Drupal\path\AliasManagerInterface
    */
   protected $aliasManager;
 
@@ -35,7 +35,7 @@ class PathController extends ControllerBase {
    *
    * @param \Drupal\Core\Path\AliasStorageInterface $alias_storage
    *   The path alias storage.
-   * @param \Drupal\Core\Path\AliasManagerInterface $alias_manager
+   * @param \Drupal\path\AliasManagerInterface $alias_manager
    *   The path alias manager.
    */
   public function __construct(AliasStorageInterface $alias_storage, AliasManagerInterface $alias_manager) {
diff --git a/core/lib/Drupal/Core/Path/Entity/PathAlias.php b/core/modules/path/src/Entity/PathAlias.php
similarity index 94%
rename from core/lib/Drupal/Core/Path/Entity/PathAlias.php
rename to core/modules/path/src/Entity/PathAlias.php
index ce96d61a0a..bbcedf451c 100644
--- a/core/lib/Drupal/Core/Path/Entity/PathAlias.php
+++ b/core/modules/path/src/Entity/PathAlias.php
@@ -1,6 +1,6 @@
 <?php
 
-namespace Drupal\Core\Path\Entity;
+namespace Drupal\path\Entity;
 
 use Drupal\Core\Entity\ContentEntityBase;
 use Drupal\Core\Entity\EntityStorageInterface;
@@ -8,7 +8,7 @@
 use Drupal\Core\Field\BaseFieldDefinition;
 use Drupal\Core\Language\LanguageInterface;
 use Drupal\Core\StringTranslation\TranslatableMarkup;
-use Drupal\Core\Path\PathAliasInterface;
+use Drupal\path\PathAliasInterface;
 
 /**
  * Defines the path_alias entity class.
@@ -24,8 +24,8 @@
  *     plural = "@count path aliases"
  *   ),
  *   handlers = {
- *     "storage" = "Drupal\Core\Path\PathAliasStorage",
- *     "storage_schema" = "Drupal\Core\Path\PathAliasStorageSchema",
+ *     "storage" = "Drupal\path\PathAliasStorage",
+ *     "storage_schema" = "Drupal\path\PathAliasStorageSchema",
  *   },
  *   base_table = "path_alias",
  *   revision_table = "path_alias_revision",
diff --git a/core/lib/Drupal/Core/EventSubscriber/PathSubscriber.php b/core/modules/path/src/EventSubscriber/PathAliasSubscriber.php
similarity index 88%
rename from core/lib/Drupal/Core/EventSubscriber/PathSubscriber.php
rename to core/modules/path/src/EventSubscriber/PathAliasSubscriber.php
index 819fdf94b7..ada15f15d6 100644
--- a/core/lib/Drupal/Core/EventSubscriber/PathSubscriber.php
+++ b/core/modules/path/src/EventSubscriber/PathAliasSubscriber.php
@@ -1,8 +1,8 @@
 <?php
 
-namespace Drupal\Core\EventSubscriber;
+namespace Drupal\path\EventSubscriber;
 
-use Drupal\Core\Path\AliasManagerInterface;
+use Drupal\path\AliasManagerInterface;
 use Drupal\Core\Path\CurrentPathStack;
 use Symfony\Component\HttpKernel\KernelEvents;
 use Symfony\Component\HttpKernel\Event\FilterControllerEvent;
@@ -12,12 +12,12 @@
 /**
  * Provides a path subscriber that converts path aliases.
  */
-class PathSubscriber implements EventSubscriberInterface {
+class PathAliasSubscriber implements EventSubscriberInterface {
 
   /**
    * The alias manager that caches alias lookups based on the request.
    *
-   * @var \Drupal\Core\Path\AliasManagerInterface
+   * @var \Drupal\path\AliasManagerInterface
    */
   protected $aliasManager;
 
@@ -31,7 +31,7 @@ class PathSubscriber implements EventSubscriberInterface {
   /**
    * Constructs a new PathSubscriber instance.
    *
-   * @param \Drupal\Core\Path\AliasManagerInterface $alias_manager
+   * @param \Drupal\path\AliasManagerInterface $alias_manager
    *   The alias manager.
    * @param \Drupal\Core\Path\CurrentPathStack $current_path
    *   The current path.
diff --git a/core/modules/path/src/Form/PathFormBase.php b/core/modules/path/src/Form/PathFormBase.php
index 4b1cbd5912..0207c3e602 100644
--- a/core/modules/path/src/Form/PathFormBase.php
+++ b/core/modules/path/src/Form/PathFormBase.php
@@ -5,7 +5,7 @@
 use Drupal\Core\Form\FormBase;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Language\LanguageInterface;
-use Drupal\Core\Path\AliasManagerInterface;
+use Drupal\path\AliasManagerInterface;
 use Drupal\Core\Path\AliasStorageInterface;
 use Drupal\Core\Path\PathValidatorInterface;
 use Drupal\Core\Routing\RequestContext;
@@ -33,7 +33,7 @@
   /**
    * The path alias manager.
    *
-   * @var \Drupal\Core\Path\AliasManagerInterface
+   * @var \Drupal\path\AliasManagerInterface
    */
   protected $aliasManager;
 
@@ -56,7 +56,7 @@
    *
    * @param \Drupal\Core\Path\AliasStorageInterface $alias_storage
    *   The path alias storage.
-   * @param \Drupal\Core\Path\AliasManagerInterface $alias_manager
+   * @param \Drupal\path\AliasManagerInterface $alias_manager
    *   The path alias manager.
    * @param \Drupal\Core\Path\PathValidatorInterface $path_validator
    *   The path validator.
diff --git a/core/modules/path/src/Form/SystemInformationFormAlter.php b/core/modules/path/src/Form/SystemInformationFormAlter.php
new file mode 100644
index 0000000000..8d275e4ccb
--- /dev/null
+++ b/core/modules/path/src/Form/SystemInformationFormAlter.php
@@ -0,0 +1,78 @@
+<?php
+
+namespace Drupal\path\Form;
+
+use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\path\AliasManagerInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Alteration class for the site information settings form.
+ */
+class SystemInformationFormAlter implements ContainerInjectionInterface {
+
+  /**
+   * The path alias manager.
+   *
+   * @var \Drupal\path\AliasManagerInterface
+   */
+  protected $aliasManager;
+
+  /**
+   * Constructs a SystemInformationFormAlter object.
+   *
+   * @param \Drupal\path\AliasManagerInterface $alias_manager
+   *   The path alias manager.
+   */
+  public function __construct(AliasManagerInterface $alias_manager) {
+    $this->aliasManager = $alias_manager;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static($container->get('path.alias_manager'));
+  }
+
+  /**
+   * Alters the specified form.
+   *
+   * @param array $form
+   *   A form array.
+   */
+  public function alterForm(array &$form) {
+    $front_page = &$form['front_page']['site_frontpage']['#default_value'];
+    if ($front_page !== '') {
+      $front_page = $this->aliasManager->getAliasByPath($front_page);
+    }
+    array_unshift($form['#validate'], [$this, 'validateForm']);
+  }
+
+  /**
+   * Validates the specified form.
+   *
+   * @param array $form
+   *   A form array.
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   The form state.
+   */
+  public function validateForm(array $form, FormStateInterface $form_state) {
+    // Check for empty front page path.
+    if (!$form_state->isValueEmpty('site_frontpage')) {
+      // Get the normal path of the front page.
+      $form_state->setValueForElement($form['front_page']['site_frontpage'], $this->aliasManager->getPathByAlias($form_state->getValue('site_frontpage')));
+    }
+
+    // Get the normal paths of both error pages.
+    if (!$form_state->isValueEmpty('site_403')) {
+      $form_state->setValueForElement($form['error_page']['site_403'], $this->aliasManager->getPathByAlias($form_state->getValue('site_403')));
+    }
+
+    if (!$form_state->isValueEmpty('site_404')) {
+      $form_state->setValueForElement($form['error_page']['site_404'], $this->aliasManager->getPathByAlias($form_state->getValue('site_404')));
+    }
+  }
+
+}
diff --git a/core/lib/Drupal/Core/Path/PathAliasInterface.php b/core/modules/path/src/PathAliasInterface.php
similarity index 96%
rename from core/lib/Drupal/Core/Path/PathAliasInterface.php
rename to core/modules/path/src/PathAliasInterface.php
index 73d2b4569f..26c6e55860 100644
--- a/core/lib/Drupal/Core/Path/PathAliasInterface.php
+++ b/core/modules/path/src/PathAliasInterface.php
@@ -1,6 +1,6 @@
 <?php
 
-namespace Drupal\Core\Path;
+namespace Drupal\path;
 
 use Drupal\Core\Entity\ContentEntityInterface;
 
diff --git a/core/lib/Drupal/Core/Path/PathAliasStorage.php b/core/modules/path/src/PathAliasStorage.php
similarity index 98%
rename from core/lib/Drupal/Core/Path/PathAliasStorage.php
rename to core/modules/path/src/PathAliasStorage.php
index a9db234c45..65e630ffe1 100644
--- a/core/lib/Drupal/Core/Path/PathAliasStorage.php
+++ b/core/modules/path/src/PathAliasStorage.php
@@ -1,6 +1,6 @@
 <?php
 
-namespace Drupal\Core\Path;
+namespace Drupal\path;
 
 use Drupal\Core\Entity\EntityInterface;
 use Drupal\Core\Entity\Sql\SqlContentEntityStorage;
diff --git a/core/lib/Drupal/Core/Path/PathAliasStorageSchema.php b/core/modules/path/src/PathAliasStorageSchema.php
similarity index 95%
rename from core/lib/Drupal/Core/Path/PathAliasStorageSchema.php
rename to core/modules/path/src/PathAliasStorageSchema.php
index 2d23c85e4f..4aceded28a 100644
--- a/core/lib/Drupal/Core/Path/PathAliasStorageSchema.php
+++ b/core/modules/path/src/PathAliasStorageSchema.php
@@ -1,6 +1,6 @@
 <?php
 
-namespace Drupal\Core\Path;
+namespace Drupal\path;
 
 use Drupal\Core\Entity\ContentEntityTypeInterface;
 use Drupal\Core\Entity\Sql\SqlContentEntityStorageSchema;
diff --git a/core/lib/Drupal/Core/PathProcessor/PathProcessorAlias.php b/core/modules/path/src/PathProcessor/AliasPathProcessor.php
similarity index 79%
rename from core/lib/Drupal/Core/PathProcessor/PathProcessorAlias.php
rename to core/modules/path/src/PathProcessor/AliasPathProcessor.php
index d0690fee20..57594e8201 100644
--- a/core/lib/Drupal/Core/PathProcessor/PathProcessorAlias.php
+++ b/core/modules/path/src/PathProcessor/AliasPathProcessor.php
@@ -1,27 +1,29 @@
 <?php
 
-namespace Drupal\Core\PathProcessor;
+namespace Drupal\path\PathProcessor;
 
-use Drupal\Core\Path\AliasManagerInterface;
+use Drupal\Core\PathProcessor\InboundPathProcessorInterface;
+use Drupal\Core\PathProcessor\OutboundPathProcessorInterface;
+use Drupal\path\AliasManagerInterface;
 use Drupal\Core\Render\BubbleableMetadata;
 use Symfony\Component\HttpFoundation\Request;
 
 /**
  * Processes the inbound path using path alias lookups.
  */
-class PathProcessorAlias implements InboundPathProcessorInterface, OutboundPathProcessorInterface {
+class AliasPathProcessor implements InboundPathProcessorInterface, OutboundPathProcessorInterface {
 
   /**
    * An alias manager for looking up the system path.
    *
-   * @var \Drupal\Core\Path\AliasManagerInterface
+   * @var \Drupal\path\AliasManagerInterface
    */
   protected $aliasManager;
 
   /**
-   * Constructs a PathProcessorAlias object.
+   * Constructs a AliasPathProcessor object.
    *
-   * @param \Drupal\Core\Path\AliasManagerInterface $alias_manager
+   * @param \Drupal\path\AliasManagerInterface $alias_manager
    *   An alias manager for looking up the system path.
    */
   public function __construct(AliasManagerInterface $alias_manager) {
diff --git a/core/modules/system/tests/modules/path_deprecated_test/path_deprecated_test.info.yml b/core/modules/path/tests/modules/path_deprecated_test/path_deprecated_test.info.yml
similarity index 100%
rename from core/modules/system/tests/modules/path_deprecated_test/path_deprecated_test.info.yml
rename to core/modules/path/tests/modules/path_deprecated_test/path_deprecated_test.info.yml
diff --git a/core/modules/system/tests/modules/path_deprecated_test/path_deprecated_test.module b/core/modules/path/tests/modules/path_deprecated_test/path_deprecated_test.module
similarity index 100%
rename from core/modules/system/tests/modules/path_deprecated_test/path_deprecated_test.module
rename to core/modules/path/tests/modules/path_deprecated_test/path_deprecated_test.module
diff --git a/core/tests/Drupal/FunctionalTests/Hal/PathAliasHalJsonAnonTest.php b/core/modules/path/tests/src/Functional/Hal/PathAliasHalJsonAnonTest.php
similarity index 87%
rename from core/tests/Drupal/FunctionalTests/Hal/PathAliasHalJsonAnonTest.php
rename to core/modules/path/tests/src/Functional/Hal/PathAliasHalJsonAnonTest.php
index 5c8c16c6a8..f99062b31a 100644
--- a/core/tests/Drupal/FunctionalTests/Hal/PathAliasHalJsonAnonTest.php
+++ b/core/modules/path/tests/src/Functional/Hal/PathAliasHalJsonAnonTest.php
@@ -1,11 +1,12 @@
 <?php
 
-namespace Drupal\FunctionalTests\Hal;
+namespace Drupal\Tests\path\Functional\Hal;
 
 use Drupal\Tests\rest\Functional\AnonResourceTestTrait;
 
 /**
  * @group hal
+ * @group path
  */
 class PathAliasHalJsonAnonTest extends PathAliasHalJsonTestBase {
 
diff --git a/core/tests/Drupal/FunctionalTests/Hal/PathAliasHalJsonBasicAuthTest.php b/core/modules/path/tests/src/Functional/Hal/PathAliasHalJsonBasicAuthTest.php
similarity index 89%
rename from core/tests/Drupal/FunctionalTests/Hal/PathAliasHalJsonBasicAuthTest.php
rename to core/modules/path/tests/src/Functional/Hal/PathAliasHalJsonBasicAuthTest.php
index 4ab304a911..1af861a524 100644
--- a/core/tests/Drupal/FunctionalTests/Hal/PathAliasHalJsonBasicAuthTest.php
+++ b/core/modules/path/tests/src/Functional/Hal/PathAliasHalJsonBasicAuthTest.php
@@ -1,11 +1,12 @@
 <?php
 
-namespace Drupal\FunctionalTests\Hal;
+namespace Drupal\Tests\path\Functional\Hal;
 
 use Drupal\Tests\rest\Functional\BasicAuthResourceTestTrait;
 
 /**
  * @group hal
+ * @group path
  */
 class PathAliasHalJsonBasicAuthTest extends PathAliasHalJsonTestBase {
 
diff --git a/core/tests/Drupal/FunctionalTests/Hal/PathAliasHalJsonCookieTest.php b/core/modules/path/tests/src/Functional/Hal/PathAliasHalJsonCookieTest.php
similarity index 89%
rename from core/tests/Drupal/FunctionalTests/Hal/PathAliasHalJsonCookieTest.php
rename to core/modules/path/tests/src/Functional/Hal/PathAliasHalJsonCookieTest.php
index df8e3f3972..aa5a2f93e1 100644
--- a/core/tests/Drupal/FunctionalTests/Hal/PathAliasHalJsonCookieTest.php
+++ b/core/modules/path/tests/src/Functional/Hal/PathAliasHalJsonCookieTest.php
@@ -1,11 +1,12 @@
 <?php
 
-namespace Drupal\FunctionalTests\Hal;
+namespace Drupal\Tests\path\Functional\Hal;
 
 use Drupal\Tests\rest\Functional\CookieResourceTestTrait;
 
 /**
  * @group hal
+ * @group path
  */
 class PathAliasHalJsonCookieTest extends PathAliasHalJsonTestBase {
 
diff --git a/core/tests/Drupal/FunctionalTests/Hal/PathAliasHalJsonTestBase.php b/core/modules/path/tests/src/Functional/Hal/PathAliasHalJsonTestBase.php
similarity index 91%
rename from core/tests/Drupal/FunctionalTests/Hal/PathAliasHalJsonTestBase.php
rename to core/modules/path/tests/src/Functional/Hal/PathAliasHalJsonTestBase.php
index be9ac82955..4770d1c1d9 100644
--- a/core/tests/Drupal/FunctionalTests/Hal/PathAliasHalJsonTestBase.php
+++ b/core/modules/path/tests/src/Functional/Hal/PathAliasHalJsonTestBase.php
@@ -1,9 +1,9 @@
 <?php
 
-namespace Drupal\FunctionalTests\Hal;
+namespace Drupal\Tests\path\Functional\Hal;
 
-use Drupal\FunctionalTests\Rest\PathAliasResourceTestBase;
 use Drupal\Tests\hal\Functional\EntityResource\HalEntityNormalizationTrait;
+use Drupal\Tests\path\Functional\Rest\PathAliasResourceTestBase;
 
 /**
  * Base hal_json test class for the path_alias entity type.
diff --git a/core/tests/Drupal/FunctionalTests/Rest/PathAliasJsonAnonTest.php b/core/modules/path/tests/src/Functional/Rest/PathAliasJsonAnonTest.php
similarity index 89%
rename from core/tests/Drupal/FunctionalTests/Rest/PathAliasJsonAnonTest.php
rename to core/modules/path/tests/src/Functional/Rest/PathAliasJsonAnonTest.php
index 9febf9eade..1bff96b536 100644
--- a/core/tests/Drupal/FunctionalTests/Rest/PathAliasJsonAnonTest.php
+++ b/core/modules/path/tests/src/Functional/Rest/PathAliasJsonAnonTest.php
@@ -1,6 +1,6 @@
 <?php
 
-namespace Drupal\FunctionalTests\Rest;
+namespace Drupal\Tests\path\Functional\Rest;
 
 use Drupal\Tests\rest\Functional\AnonResourceTestTrait;
 
diff --git a/core/tests/Drupal/FunctionalTests/Rest/PathAliasJsonBasicAuthTest.php b/core/modules/path/tests/src/Functional/Rest/PathAliasJsonBasicAuthTest.php
similarity index 92%
rename from core/tests/Drupal/FunctionalTests/Rest/PathAliasJsonBasicAuthTest.php
rename to core/modules/path/tests/src/Functional/Rest/PathAliasJsonBasicAuthTest.php
index 9615f42b87..cf24991b85 100644
--- a/core/tests/Drupal/FunctionalTests/Rest/PathAliasJsonBasicAuthTest.php
+++ b/core/modules/path/tests/src/Functional/Rest/PathAliasJsonBasicAuthTest.php
@@ -1,6 +1,6 @@
 <?php
 
-namespace Drupal\FunctionalTests\Rest;
+namespace Drupal\Tests\path\Functional\Rest;
 
 use Drupal\Tests\rest\Functional\BasicAuthResourceTestTrait;
 
diff --git a/core/tests/Drupal/FunctionalTests/Rest/PathAliasJsonCookieTest.php b/core/modules/path/tests/src/Functional/Rest/PathAliasJsonCookieTest.php
similarity index 91%
rename from core/tests/Drupal/FunctionalTests/Rest/PathAliasJsonCookieTest.php
rename to core/modules/path/tests/src/Functional/Rest/PathAliasJsonCookieTest.php
index ebf456420a..7fd54f9624 100644
--- a/core/tests/Drupal/FunctionalTests/Rest/PathAliasJsonCookieTest.php
+++ b/core/modules/path/tests/src/Functional/Rest/PathAliasJsonCookieTest.php
@@ -1,6 +1,6 @@
 <?php
 
-namespace Drupal\FunctionalTests\Rest;
+namespace Drupal\Tests\path\Functional\Rest;
 
 use Drupal\Tests\rest\Functional\CookieResourceTestTrait;
 
diff --git a/core/tests/Drupal/FunctionalTests/Rest/PathAliasResourceTestBase.php b/core/modules/path/tests/src/Functional/Rest/PathAliasResourceTestBase.php
similarity index 93%
rename from core/tests/Drupal/FunctionalTests/Rest/PathAliasResourceTestBase.php
rename to core/modules/path/tests/src/Functional/Rest/PathAliasResourceTestBase.php
index 29adab111d..e541d0dab3 100644
--- a/core/tests/Drupal/FunctionalTests/Rest/PathAliasResourceTestBase.php
+++ b/core/modules/path/tests/src/Functional/Rest/PathAliasResourceTestBase.php
@@ -1,9 +1,9 @@
 <?php
 
-namespace Drupal\FunctionalTests\Rest;
+namespace Drupal\Tests\path\Functional\Rest;
 
 use Drupal\Core\Language\LanguageInterface;
-use Drupal\Core\Path\Entity\PathAlias;
+use Drupal\path\Entity\PathAlias;
 use Drupal\Tests\rest\Functional\BcTimestampNormalizerUnixTestTrait;
 use Drupal\Tests\rest\Functional\EntityResource\EntityResourceTestBase;
 
@@ -14,6 +14,11 @@
 
   use BcTimestampNormalizerUnixTestTrait;
 
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['path'];
+
   /**
    * {@inheritdoc}
    */
diff --git a/core/tests/Drupal/FunctionalTests/Rest/PathAliasXmlAnonTest.php b/core/modules/path/tests/src/Functional/Rest/PathAliasXmlAnonTest.php
similarity index 92%
rename from core/tests/Drupal/FunctionalTests/Rest/PathAliasXmlAnonTest.php
rename to core/modules/path/tests/src/Functional/Rest/PathAliasXmlAnonTest.php
index e0575a913e..4d92613b51 100644
--- a/core/tests/Drupal/FunctionalTests/Rest/PathAliasXmlAnonTest.php
+++ b/core/modules/path/tests/src/Functional/Rest/PathAliasXmlAnonTest.php
@@ -1,6 +1,6 @@
 <?php
 
-namespace Drupal\FunctionalTests\Rest;
+namespace Drupal\Tests\path\Functional\Rest;
 
 use Drupal\Tests\rest\Functional\AnonResourceTestTrait;
 use Drupal\Tests\rest\Functional\EntityResource\XmlEntityNormalizationQuirksTrait;
diff --git a/core/tests/Drupal/FunctionalTests/Rest/PathAliasXmlBasicAuthTest.php b/core/modules/path/tests/src/Functional/Rest/PathAliasXmlBasicAuthTest.php
similarity index 94%
rename from core/tests/Drupal/FunctionalTests/Rest/PathAliasXmlBasicAuthTest.php
rename to core/modules/path/tests/src/Functional/Rest/PathAliasXmlBasicAuthTest.php
index 8830a9ad6d..5b9259e842 100644
--- a/core/tests/Drupal/FunctionalTests/Rest/PathAliasXmlBasicAuthTest.php
+++ b/core/modules/path/tests/src/Functional/Rest/PathAliasXmlBasicAuthTest.php
@@ -1,6 +1,6 @@
 <?php
 
-namespace Drupal\FunctionalTests\Rest;
+namespace Drupal\Tests\path\Functional\Rest;
 
 use Drupal\Tests\rest\Functional\BasicAuthResourceTestTrait;
 use Drupal\Tests\rest\Functional\EntityResource\XmlEntityNormalizationQuirksTrait;
diff --git a/core/tests/Drupal/FunctionalTests/Rest/PathAliasXmlCookieTest.php b/core/modules/path/tests/src/Functional/Rest/PathAliasXmlCookieTest.php
similarity index 92%
rename from core/tests/Drupal/FunctionalTests/Rest/PathAliasXmlCookieTest.php
rename to core/modules/path/tests/src/Functional/Rest/PathAliasXmlCookieTest.php
index 11a9b7d392..9dc71cc2d5 100644
--- a/core/tests/Drupal/FunctionalTests/Rest/PathAliasXmlCookieTest.php
+++ b/core/modules/path/tests/src/Functional/Rest/PathAliasXmlCookieTest.php
@@ -1,6 +1,6 @@
 <?php
 
-namespace Drupal\FunctionalTests\Rest;
+namespace Drupal\Tests\path\Functional\Rest;
 
 use Drupal\Tests\rest\Functional\CookieResourceTestTrait;
 use Drupal\Tests\rest\Functional\EntityResource\XmlEntityNormalizationQuirksTrait;
diff --git a/core/modules/system/tests/src/Functional/Path/UrlAlterFunctionalTest.php b/core/modules/path/tests/src/Functional/UrlAlterFunctionalTest.php
similarity index 98%
rename from core/modules/system/tests/src/Functional/Path/UrlAlterFunctionalTest.php
rename to core/modules/path/tests/src/Functional/UrlAlterFunctionalTest.php
index 88e3d42e2f..e1decf0ba8 100644
--- a/core/modules/system/tests/src/Functional/Path/UrlAlterFunctionalTest.php
+++ b/core/modules/path/tests/src/Functional/UrlAlterFunctionalTest.php
@@ -1,6 +1,6 @@
 <?php
 
-namespace Drupal\Tests\system\Functional\Path;
+namespace Drupal\Tests\path\Functional;
 
 use Drupal\Component\Render\FormattableMarkup;
 use Drupal\Core\Database\Database;
@@ -11,7 +11,7 @@
 /**
  * Tests altering the inbound path and the outbound path.
  *
- * @group Path
+ * @group path
  */
 class UrlAlterFunctionalTest extends BrowserTestBase {
 
diff --git a/core/tests/Drupal/KernelTests/Core/Path/AliasTest.php b/core/modules/path/tests/src/Kernel/AliasTest.php
similarity index 98%
rename from core/tests/Drupal/KernelTests/Core/Path/AliasTest.php
rename to core/modules/path/tests/src/Kernel/AliasTest.php
index bd26e1c6e0..b84e03c950 100644
--- a/core/tests/Drupal/KernelTests/Core/Path/AliasTest.php
+++ b/core/modules/path/tests/src/Kernel/AliasTest.php
@@ -1,21 +1,26 @@
 <?php
 
-namespace Drupal\KernelTests\Core\Path;
+namespace Drupal\Tests\path\Kernel;
 
 use Drupal\Component\Render\FormattableMarkup;
 use Drupal\Core\Cache\MemoryCounterBackend;
 use Drupal\Core\Database\Database;
-use Drupal\Core\Path\AliasManager;
-use Drupal\Core\Path\AliasWhitelist;
+use Drupal\path\AliasManager;
+use Drupal\path\AliasWhitelist;
 use Drupal\KernelTests\KernelTestBase;
 
 /**
  * Tests path alias CRUD and lookup functionality.
  *
- * @group Path
+ * @group path
  */
 class AliasTest extends KernelTestBase {
 
+  /**
+   * {@inheritdoc}
+   */
+  protected static $modules = ['path'];
+
   /**
    * {@inheritdoc}
    */
diff --git a/core/modules/system/tests/src/Kernel/DeprecatedPathHooksTest.php b/core/modules/path/tests/src/Kernel/DeprecatedPathHooksTest.php
similarity index 96%
rename from core/modules/system/tests/src/Kernel/DeprecatedPathHooksTest.php
rename to core/modules/path/tests/src/Kernel/DeprecatedPathHooksTest.php
index 75f3ae4a7f..2bf177c13b 100644
--- a/core/modules/system/tests/src/Kernel/DeprecatedPathHooksTest.php
+++ b/core/modules/path/tests/src/Kernel/DeprecatedPathHooksTest.php
@@ -1,6 +1,6 @@
 <?php
 
-namespace Drupal\Tests\system\Kernel;
+namespace Drupal\Tests\path\Kernel;
 
 use Drupal\Core\Language\LanguageInterface;
 use Drupal\KernelTests\KernelTestBase;
@@ -16,7 +16,7 @@ class DeprecatedPathHooksTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system', 'path_deprecated_test'];
+  public static $modules = ['path', 'path_deprecated_test'];
 
   /**
    * {@inheritdoc}
diff --git a/core/modules/system/tests/src/Kernel/PathHooksTest.php b/core/modules/path/tests/src/Kernel/PathHooksTest.php
similarity index 93%
rename from core/modules/system/tests/src/Kernel/PathHooksTest.php
rename to core/modules/path/tests/src/Kernel/PathHooksTest.php
index 0c4638cbad..25a3afa02c 100644
--- a/core/modules/system/tests/src/Kernel/PathHooksTest.php
+++ b/core/modules/path/tests/src/Kernel/PathHooksTest.php
@@ -1,21 +1,21 @@
 <?php
 
-namespace Drupal\Tests\system\Kernel;
+namespace Drupal\Tests\path\Kernel;
 
 use Drupal\Core\Language\LanguageInterface;
-use Drupal\Core\Path\AliasManagerInterface;
+use Drupal\path\AliasManagerInterface;
 use Drupal\KernelTests\KernelTestBase;
 use Prophecy\Argument;
 
 /**
- * @group Drupal
+ * @group path
  */
 class PathHooksTest extends KernelTestBase {
 
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system'];
+  public static $modules = ['path'];
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/Tests/Core/Path/AliasManagerTest.php b/core/modules/path/tests/src/Unit/AliasManagerTest.php
similarity index 97%
rename from core/tests/Drupal/Tests/Core/Path/AliasManagerTest.php
rename to core/modules/path/tests/src/Unit/AliasManagerTest.php
index 644af818d7..a39e108f20 100644
--- a/core/tests/Drupal/Tests/Core/Path/AliasManagerTest.php
+++ b/core/modules/path/tests/src/Unit/AliasManagerTest.php
@@ -1,22 +1,22 @@
 <?php
 
-namespace Drupal\Tests\Core\Path;
+namespace Drupal\Tests\path\Unit;
 
 use Drupal\Core\Language\Language;
 use Drupal\Core\Language\LanguageInterface;
-use Drupal\Core\Path\AliasManager;
+use Drupal\path\AliasManager;
 use Drupal\Tests\UnitTestCase;
 
 /**
- * @coversDefaultClass \Drupal\Core\Path\AliasManager
- * @group Path
+ * @coversDefaultClass \Drupal\path\AliasManager
+ * @group path
  */
 class AliasManagerTest extends UnitTestCase {
 
   /**
    * The alias manager.
    *
-   * @var \Drupal\Core\Path\AliasManager
+   * @var \Drupal\path\AliasManager
    */
   protected $aliasManager;
 
@@ -30,7 +30,7 @@ class AliasManagerTest extends UnitTestCase {
   /**
    * Alias whitelist.
    *
-   * @var \Drupal\Core\Path\AliasWhitelistInterface|\PHPUnit\Framework\MockObject\MockObject
+   * @var \Drupal\path\AliasWhitelistInterface|\PHPUnit\Framework\MockObject\MockObject
    */
   protected $aliasWhitelist;
 
@@ -69,7 +69,7 @@ protected function setUp() {
     parent::setUp();
 
     $this->aliasStorage = $this->createMock('Drupal\Core\Path\AliasStorageInterface');
-    $this->aliasWhitelist = $this->createMock('Drupal\Core\Path\AliasWhitelistInterface');
+    $this->aliasWhitelist = $this->createMock('Drupal\path\AliasWhitelistInterface');
     $this->languageManager = $this->createMock('Drupal\Core\Language\LanguageManagerInterface');
     $this->cache = $this->createMock('Drupal\Core\Cache\CacheBackendInterface');
 
diff --git a/core/tests/Drupal/Tests/Core/PathProcessor/PathProcessorAliasTest.php b/core/modules/path/tests/src/Unit/PathProcessor/AliasPathProcessorTest.php
similarity index 77%
rename from core/tests/Drupal/Tests/Core/PathProcessor/PathProcessorAliasTest.php
rename to core/modules/path/tests/src/Unit/PathProcessor/AliasPathProcessorTest.php
index 8a2a17ecd6..8d7c32e96f 100644
--- a/core/tests/Drupal/Tests/Core/PathProcessor/PathProcessorAliasTest.php
+++ b/core/modules/path/tests/src/Unit/PathProcessor/AliasPathProcessorTest.php
@@ -1,42 +1,43 @@
 <?php
 
-namespace Drupal\Tests\Core\PathProcessor;
+namespace Drupal\Tests\path\Unit\PathProcessor;
 
 use Drupal\Core\Cache\Cache;
-use Drupal\Core\PathProcessor\PathProcessorAlias;
+use Drupal\path\PathProcessor\AliasPathProcessor;
 use Drupal\Core\Render\BubbleableMetadata;
 use Drupal\Tests\UnitTestCase;
 use Symfony\Component\HttpFoundation\Request;
 
 /**
- * @coversDefaultClass \Drupal\Core\PathProcessor\PathProcessorAlias
+ * @coversDefaultClass \Drupal\path\PathProcessor\AliasPathProcessor
  * @group PathProcessor
+ * @group path
  */
-class PathProcessorAliasTest extends UnitTestCase {
+class AliasPathProcessorTest extends UnitTestCase {
 
   /**
    * The mocked alias manager.
    *
-   * @var \Drupal\Core\Path\AliasManagerInterface|\PHPUnit\Framework\MockObject\MockObject
+   * @var \Drupal\path\AliasManagerInterface|\PHPUnit\Framework\MockObject\MockObject
    */
   protected $aliasManager;
 
   /**
    * The tested path processor.
    *
-   * @var \Drupal\Core\PathProcessor\PathProcessorAlias
+   * @var \Drupal\path\PathProcessor\AliasPathProcessor
    */
   protected $pathProcessor;
 
   protected function setUp() {
-    $this->aliasManager = $this->createMock('Drupal\Core\Path\AliasManagerInterface');
-    $this->pathProcessor = new PathProcessorAlias($this->aliasManager);
+    $this->aliasManager = $this->createMock('Drupal\path\AliasManagerInterface');
+    $this->pathProcessor = new AliasPathProcessor($this->aliasManager);
   }
 
   /**
    * Tests the processInbound method.
    *
-   * @see \Drupal\Core\PathProcessor\PathProcessorAlias::processInbound
+   * @see \Drupal\Core\PathProcessor\AliasPathProcessor::processInbound
    */
   public function testProcessInbound() {
     $this->aliasManager->expects($this->exactly(2))
diff --git a/core/modules/system/src/Form/SiteInformationForm.php b/core/modules/system/src/Form/SiteInformationForm.php
index 4e4e1571fd..3529e0aa99 100644
--- a/core/modules/system/src/Form/SiteInformationForm.php
+++ b/core/modules/system/src/Form/SiteInformationForm.php
@@ -3,9 +3,8 @@
 namespace Drupal\system\Form;
 
 use Drupal\Core\Config\ConfigFactoryInterface;
-use Drupal\Core\Form\FormStateInterface;
-use Drupal\Core\Path\AliasManagerInterface;
 use Drupal\Core\Form\ConfigFormBase;
+use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Path\PathValidatorInterface;
 use Drupal\Core\Routing\RequestContext;
 use Symfony\Component\DependencyInjection\ContainerInterface;
@@ -17,13 +16,6 @@
  */
 class SiteInformationForm extends ConfigFormBase {
 
-  /**
-   * The path alias manager.
-   *
-   * @var \Drupal\Core\Path\AliasManagerInterface
-   */
-  protected $aliasManager;
-
   /**
    * The path validator.
    *
@@ -43,17 +35,14 @@ class SiteInformationForm extends ConfigFormBase {
    *
    * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
    *   The factory for configuration objects.
-   * @param \Drupal\Core\Path\AliasManagerInterface $alias_manager
-   *   The path alias manager.
    * @param \Drupal\Core\Path\PathValidatorInterface $path_validator
    *   The path validator.
    * @param \Drupal\Core\Routing\RequestContext $request_context
    *   The request context.
    */
-  public function __construct(ConfigFactoryInterface $config_factory, AliasManagerInterface $alias_manager, PathValidatorInterface $path_validator, RequestContext $request_context) {
+  public function __construct(ConfigFactoryInterface $config_factory, PathValidatorInterface $path_validator, RequestContext $request_context) {
     parent::__construct($config_factory);
 
-    $this->aliasManager = $alias_manager;
     $this->pathValidator = $path_validator;
     $this->requestContext = $request_context;
   }
@@ -64,7 +53,6 @@ public function __construct(ConfigFactoryInterface $config_factory, AliasManager
   public static function create(ContainerInterface $container) {
     return new static(
       $container->get('config.factory'),
-      $container->get('path.alias_manager'),
       $container->get('path.validator'),
       $container->get('router.request_context')
     );
@@ -123,7 +111,7 @@ public function buildForm(array $form, FormStateInterface $form_state) {
       '#title' => t('Front page'),
       '#open' => TRUE,
     ];
-    $front_page = $site_config->get('page.front') != '/user/login' ? $this->aliasManager->getAliasByPath($site_config->get('page.front')) : '';
+    $front_page = $site_config->get('page.front') !== '/user/login' ? $site_config->get('page.front') : '';
     $form['front_page']['site_frontpage'] = [
       '#type' => 'textfield',
       '#title' => t('Default front page'),
@@ -164,10 +152,6 @@ public function validateForm(array &$form, FormStateInterface $form_state) {
       // Set to default "user/login".
       $form_state->setValueForElement($form['front_page']['site_frontpage'], '/user/login');
     }
-    else {
-      // Get the normal path of the front page.
-      $form_state->setValueForElement($form['front_page']['site_frontpage'], $this->aliasManager->getPathByAlias($form_state->getValue('site_frontpage')));
-    }
     // Validate front page path.
     if (($value = $form_state->getValue('site_frontpage')) && $value[0] !== '/') {
       $form_state->setErrorByName('site_frontpage', $this->t("The path '%path' has to start with a slash.", ['%path' => $form_state->getValue('site_frontpage')]));
@@ -176,13 +160,6 @@ public function validateForm(array &$form, FormStateInterface $form_state) {
     if (!$this->pathValidator->isValid($form_state->getValue('site_frontpage'))) {
       $form_state->setErrorByName('site_frontpage', $this->t("Either the path '%path' is invalid or you do not have access to it.", ['%path' => $form_state->getValue('site_frontpage')]));
     }
-    // Get the normal paths of both error pages.
-    if (!$form_state->isValueEmpty('site_403')) {
-      $form_state->setValueForElement($form['error_page']['site_403'], $this->aliasManager->getPathByAlias($form_state->getValue('site_403')));
-    }
-    if (!$form_state->isValueEmpty('site_404')) {
-      $form_state->setValueForElement($form['error_page']['site_404'], $this->aliasManager->getPathByAlias($form_state->getValue('site_404')));
-    }
     if (($value = $form_state->getValue('site_403')) && $value[0] !== '/') {
       $form_state->setErrorByName('site_403', $this->t("The path '%path' has to start with a slash.", ['%path' => $form_state->getValue('site_403')]));
     }
diff --git a/core/modules/system/src/Plugin/Condition/RequestPath.php b/core/modules/system/src/Plugin/Condition/RequestPath.php
index 1f73624774..15743f864c 100644
--- a/core/modules/system/src/Plugin/Condition/RequestPath.php
+++ b/core/modules/system/src/Plugin/Condition/RequestPath.php
@@ -4,7 +4,7 @@
 
 use Drupal\Core\Condition\ConditionPluginBase;
 use Drupal\Core\Form\FormStateInterface;
-use Drupal\Core\Path\AliasManagerInterface;
+use Drupal\path\AliasManagerInterface;
 use Drupal\Core\Path\CurrentPathStack;
 use Drupal\Core\Path\PathMatcherInterface;
 use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
@@ -24,7 +24,7 @@ class RequestPath extends ConditionPluginBase implements ContainerFactoryPluginI
   /**
    * An alias manager to find the alias for the current system path.
    *
-   * @var \Drupal\Core\Path\AliasManagerInterface
+   * @var \Drupal\path\AliasManagerInterface
    */
   protected $aliasManager;
 
@@ -52,7 +52,7 @@ class RequestPath extends ConditionPluginBase implements ContainerFactoryPluginI
   /**
    * Constructs a RequestPath condition plugin.
    *
-   * @param \Drupal\Core\Path\AliasManagerInterface $alias_manager
+   * @param \Drupal\path\AliasManagerInterface $alias_manager
    *   An alias manager to find the alias for the current system path.
    * @param \Drupal\Core\Path\PathMatcherInterface $path_matcher
    *   The path matcher service.
diff --git a/core/modules/system/src/Tests/Routing/MockAliasManager.php b/core/modules/system/src/Tests/Routing/MockAliasManager.php
index 09f36366fc..7f764422d2 100644
--- a/core/modules/system/src/Tests/Routing/MockAliasManager.php
+++ b/core/modules/system/src/Tests/Routing/MockAliasManager.php
@@ -2,7 +2,7 @@
 
 namespace Drupal\system\Tests\Routing;
 
-use Drupal\Core\Path\AliasManagerInterface;
+use Drupal\path\AliasManagerInterface;
 
 /**
  * An easily configurable mock alias manager.
diff --git a/core/modules/system/system.install b/core/modules/system/system.install
index 69433cf897..38ccb58a37 100644
--- a/core/modules/system/system.install
+++ b/core/modules/system/system.install
@@ -20,9 +20,9 @@
 use Drupal\Core\Extension\Extension;
 use Drupal\Core\Field\BaseFieldDefinition;
 use Drupal\Core\File\FileSystemInterface;
-use Drupal\Core\Path\Entity\PathAlias;
-use Drupal\Core\Path\PathAliasStorage;
-use Drupal\Core\Path\PathAliasStorageSchema;
+use Drupal\path\Entity\PathAlias;
+use Drupal\path\PathAliasStorage;
+use Drupal\path\PathAliasStorageSchema;
 use Drupal\Core\Site\Settings;
 use Drupal\Core\StreamWrapper\PrivateStream;
 use Drupal\Core\StreamWrapper\PublicStream;
@@ -2362,6 +2362,11 @@ function system_update_8802() {
  * Install the 'path_alias' entity type.
  */
 function system_update_8803() {
+  // Enable the Path module if needed.
+  if (!\Drupal::moduleHandler()->moduleExists('path')) {
+    \Drupal::service('module_installer')->install(['path'], FALSE);
+  }
+
   $entity_definition_update_manager = \Drupal::entityDefinitionUpdateManager();
   if (!$entity_definition_update_manager->getEntityType('path_alias')) {
     $entity_type = new ContentEntityType([
diff --git a/core/modules/user/tests/src/Kernel/Views/ArgumentValidateTest.php b/core/modules/user/tests/src/Kernel/Views/ArgumentValidateTest.php
index 76bfad7ce4..1f2d14cc38 100644
--- a/core/modules/user/tests/src/Kernel/Views/ArgumentValidateTest.php
+++ b/core/modules/user/tests/src/Kernel/Views/ArgumentValidateTest.php
@@ -23,6 +23,7 @@ class ArgumentValidateTest extends ViewsKernelTestBase {
    */
   public static $modules = [
     'node',
+    'path',
     'user_test_views',
   ];
 
diff --git a/core/modules/views/src/Plugin/views/argument_default/Raw.php b/core/modules/views/src/Plugin/views/argument_default/Raw.php
index 2491bd83c0..169b174cbd 100644
--- a/core/modules/views/src/Plugin/views/argument_default/Raw.php
+++ b/core/modules/views/src/Plugin/views/argument_default/Raw.php
@@ -5,7 +5,7 @@
 use Drupal\Core\Cache\Cache;
 use Drupal\Core\Cache\CacheableDependencyInterface;
 use Drupal\Core\Form\FormStateInterface;
-use Drupal\Core\Path\AliasManagerInterface;
+use Drupal\path\AliasManagerInterface;
 use Drupal\Core\Path\CurrentPathStack;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
@@ -24,7 +24,7 @@ class Raw extends ArgumentDefaultPluginBase implements CacheableDependencyInterf
   /**
    * The alias manager.
    *
-   * @var \Drupal\Core\Path\AliasManagerInterface
+   * @var \Drupal\path\AliasManagerInterface
    */
   protected $aliasManager;
 
@@ -44,7 +44,7 @@ class Raw extends ArgumentDefaultPluginBase implements CacheableDependencyInterf
    *   The plugin_id for the plugin instance.
    * @param mixed $plugin_definition
    *   The plugin implementation definition.
-   * @param \Drupal\Core\Path\AliasManagerInterface $alias_manager
+   * @param \Drupal\path\AliasManagerInterface $alias_manager
    *   The alias manager.
    * @param \Drupal\Core\Path\CurrentPathStack $current_path
    *   The current path.
diff --git a/core/modules/views/tests/src/Unit/Plugin/argument_default/RawTest.php b/core/modules/views/tests/src/Unit/Plugin/argument_default/RawTest.php
index cc8f2c78df..95ca657687 100644
--- a/core/modules/views/tests/src/Unit/Plugin/argument_default/RawTest.php
+++ b/core/modules/views/tests/src/Unit/Plugin/argument_default/RawTest.php
@@ -33,7 +33,7 @@ public function testGetArgument() {
     $view->expects($this->any())
       ->method('getRequest')
       ->will($this->returnValue($request));
-    $alias_manager = $this->createMock('Drupal\Core\Path\AliasManagerInterface');
+    $alias_manager = $this->createMock('Drupal\path\AliasManagerInterface');
     $alias_manager->expects($this->never())
       ->method('getAliasByPath');
 
@@ -71,7 +71,7 @@ public function testGetArgument() {
     $this->assertEquals(NULL, $raw->getArgument());
 
     // Setup an alias manager with a path alias.
-    $alias_manager = $this->createMock('Drupal\Core\Path\AliasManagerInterface');
+    $alias_manager = $this->createMock('Drupal\path\AliasManagerInterface');
     $alias_manager->expects($this->any())
       ->method('getAliasByPath')
       ->with($this->equalTo('/test/example'))
diff --git a/core/profiles/demo_umami/modules/demo_umami_content/src/InstallHelper.php b/core/profiles/demo_umami/modules/demo_umami_content/src/InstallHelper.php
index b072bc1925..73c751c7ea 100644
--- a/core/profiles/demo_umami/modules/demo_umami_content/src/InstallHelper.php
+++ b/core/profiles/demo_umami/modules/demo_umami_content/src/InstallHelper.php
@@ -8,7 +8,7 @@
 use Drupal\Core\Extension\ModuleHandlerInterface;
 use Drupal\Core\File\Exception\FileException;
 use Drupal\Core\File\FileSystemInterface;
-use Drupal\Core\Path\AliasManagerInterface;
+use Drupal\path\AliasManagerInterface;
 use Drupal\Core\State\StateInterface;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
@@ -23,7 +23,7 @@ class InstallHelper implements ContainerInjectionInterface {
   /**
    * The path alias manager.
    *
-   * @var \Drupal\Core\Path\AliasManagerInterface
+   * @var \Drupal\path\AliasManagerInterface
    */
   protected $aliasManager;
 
@@ -88,7 +88,7 @@ class InstallHelper implements ContainerInjectionInterface {
   /**
    * Constructs a new InstallHelper object.
    *
-   * @param \Drupal\Core\Path\AliasManagerInterface $aliasManager
+   * @param \Drupal\path\AliasManagerInterface $aliasManager
    *   The path alias manager.
    * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entityTypeManager
    *   Entity type manager.
diff --git a/core/tests/Drupal/KernelTests/Core/Command/DbDumpTest.php b/core/tests/Drupal/KernelTests/Core/Command/DbDumpTest.php
index 47fa613ab2..e26b9a0112 100644
--- a/core/tests/Drupal/KernelTests/Core/Command/DbDumpTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Command/DbDumpTest.php
@@ -22,7 +22,7 @@ class DbDumpTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system', 'config', 'dblog', 'menu_link_content', 'link', 'block_content', 'file', 'user'];
+  public static $modules = ['system', 'config', 'dblog', 'menu_link_content', 'link', 'block_content', 'file', 'path', 'user'];
 
   /**
    * Test data to write into config.
diff --git a/core/tests/Drupal/KernelTests/Core/Config/CacheabilityMetadataConfigOverrideTest.php b/core/tests/Drupal/KernelTests/Core/Config/CacheabilityMetadataConfigOverrideTest.php
index 7f3e44bb40..fd21d111d7 100644
--- a/core/tests/Drupal/KernelTests/Core/Config/CacheabilityMetadataConfigOverrideTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Config/CacheabilityMetadataConfigOverrideTest.php
@@ -20,6 +20,7 @@ class CacheabilityMetadataConfigOverrideTest extends KernelTestBase {
     'block_content',
     'config',
     'config_override_test',
+    'path',
     'system',
     'user',
   ];
diff --git a/core/tests/Drupal/KernelTests/Core/Entity/CreateSampleEntityTest.php b/core/tests/Drupal/KernelTests/Core/Entity/CreateSampleEntityTest.php
index 0efc69ef14..cb1f08b645 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/CreateSampleEntityTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/CreateSampleEntityTest.php
@@ -25,7 +25,7 @@ class CreateSampleEntityTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system', 'field', 'filter', 'text', 'file', 'user', 'node', 'comment', 'taxonomy'];
+  public static $modules = ['system', 'field', 'filter', 'text', 'file', 'user', 'node', 'comment', 'taxonomy', 'path'];
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Path/AliasStorageTest.php b/core/tests/Drupal/KernelTests/Core/Path/AliasStorageTest.php
index 2e986d18b3..55d0672edf 100644
--- a/core/tests/Drupal/KernelTests/Core/Path/AliasStorageTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Path/AliasStorageTest.php
@@ -14,7 +14,7 @@ class AliasStorageTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['system'];
+  public static $modules = ['path', 'system'];
 
   /**
    * @var \Drupal\Core\Path\AliasStorage
diff --git a/core/tests/Drupal/KernelTests/Core/Path/PathValidatorTest.php b/core/tests/Drupal/KernelTests/Core/Path/PathValidatorTest.php
index a6a7eb839e..e0956d04c5 100644
--- a/core/tests/Drupal/KernelTests/Core/Path/PathValidatorTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Path/PathValidatorTest.php
@@ -22,7 +22,7 @@ class PathValidatorTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['path', 'entity_test', 'system', 'user'];
+  public static $modules = ['entity_test', 'system', 'user'];
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Path/UrlAlterTest.php b/core/tests/Drupal/KernelTests/Core/Path/UrlAlterTest.php
index 37ac65ae8e..560f2184c1 100644
--- a/core/tests/Drupal/KernelTests/Core/Path/UrlAlterTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Path/UrlAlterTest.php
@@ -17,7 +17,7 @@ class UrlAlterTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['path', 'url_alter_test', 'user'];
+  public static $modules = ['url_alter_test', 'user'];
 
   public function testUrlWithQueryString() {
     // Test outbound query string altering.
diff --git a/core/tests/Drupal/KernelTests/Core/Routing/ContentNegotiationRoutingTest.php b/core/tests/Drupal/KernelTests/Core/Routing/ContentNegotiationRoutingTest.php
index ea23b6f8e6..560afbc5e3 100644
--- a/core/tests/Drupal/KernelTests/Core/Routing/ContentNegotiationRoutingTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Routing/ContentNegotiationRoutingTest.php
@@ -17,7 +17,7 @@ class ContentNegotiationRoutingTest extends KernelTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['conneg_test'];
+  public static $modules = ['conneg_test', 'path'];
 
   /**
    * {@inheritdoc}
diff --git a/core/tests/Drupal/KernelTests/Core/Routing/RouteProviderTest.php b/core/tests/Drupal/KernelTests/Core/Routing/RouteProviderTest.php
index 1719687922..9db83b4bec 100644
--- a/core/tests/Drupal/KernelTests/Core/Routing/RouteProviderTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Routing/RouteProviderTest.php
@@ -35,7 +35,7 @@ class RouteProviderTest extends KernelTestBase {
   /**
    * Modules to enable.
    */
-  public static $modules = ['url_alter_test', 'system', 'language'];
+  public static $modules = ['url_alter_test', 'system', 'language', 'path'];
 
   /**
    * A collection of shared fixture data for tests.
@@ -575,7 +575,7 @@ public function testRouteCaching() {
     /** @var \Drupal\Core\Path\AliasStorageInterface $path_storage */
     $path_storage = \Drupal::service('path.alias_storage');
     $path_storage->save('/path/add/one', '/path/add-one');
-    /** @var \Drupal\Core\Path\AliasManagerInterface $alias_manager */
+    /** @var \Drupal\path\AliasManagerInterface $alias_manager */
     $alias_manager = \Drupal::service('path.alias_manager');
     $alias_manager->cacheClear();
 
diff --git a/core/tests/Drupal/Tests/Core/DependencyInjection/Compiler/ProxyServicesPassTest.php b/core/tests/Drupal/Tests/Core/DependencyInjection/Compiler/ProxyServicesPassTest.php
index 63b94ff463..2655a1706d 100644
--- a/core/tests/Drupal/Tests/Core/DependencyInjection/Compiler/ProxyServicesPassTest.php
+++ b/core/tests/Drupal/Tests/Core/DependencyInjection/Compiler/ProxyServicesPassTest.php
@@ -67,7 +67,7 @@ public function testContainerWithLazyServices() {
    */
   public function testContainerWithLazyServicesWithoutProxyClass() {
     $container = new ContainerBuilder();
-    $container->register('alias_whitelist', 'Drupal\Core\Path\AliasWhitelist')
+    $container->register('alias_whitelist', 'Drupal\path\AliasWhitelist')
       ->setLazy(TRUE);
 
     $this->expectException(InvalidArgumentException::class);
diff --git a/core/tests/Drupal/Tests/Core/PathProcessor/PathProcessorTest.php b/core/tests/Drupal/Tests/Core/PathProcessor/PathProcessorTest.php
index ce401b1255..557f578a78 100644
--- a/core/tests/Drupal/Tests/Core/PathProcessor/PathProcessorTest.php
+++ b/core/tests/Drupal/Tests/Core/PathProcessor/PathProcessorTest.php
@@ -4,7 +4,7 @@
 
 use Drupal\Core\Language\Language;
 use Drupal\Core\Language\LanguageInterface;
-use Drupal\Core\PathProcessor\PathProcessorAlias;
+use Drupal\path\PathProcessor\AliasPathProcessor;
 use Drupal\Core\PathProcessor\PathProcessorDecode;
 use Drupal\Core\PathProcessor\PathProcessorFront;
 use Drupal\Core\PathProcessor\PathProcessorManager;
@@ -87,7 +87,7 @@ protected function setUp() {
   public function testProcessInbound() {
 
     // Create an alias manager stub.
-    $alias_manager = $this->getMockBuilder('Drupal\Core\Path\AliasManager')
+    $alias_manager = $this->getMockBuilder('Drupal\path\AliasManager')
       ->disableOriginalConstructor()
       ->getMock();
 
@@ -148,7 +148,7 @@ public function testProcessInbound() {
       ->getMock();
 
     // Create the processors.
-    $alias_processor = new PathProcessorAlias($alias_manager);
+    $alias_processor = new AliasPathProcessor($alias_manager);
     $decode_processor = new PathProcessorDecode();
     $front_processor = new PathProcessorFront($config_factory_stub);
     $language_processor = new PathProcessorLanguage($config_factory_stub, $this->languageManager, $negotiator, $current_user, $config_subscriber);
diff --git a/core/tests/Drupal/Tests/Core/Routing/UrlGeneratorTest.php b/core/tests/Drupal/Tests/Core/Routing/UrlGeneratorTest.php
index c01aafac0d..e681991199 100644
--- a/core/tests/Drupal/Tests/Core/Routing/UrlGeneratorTest.php
+++ b/core/tests/Drupal/Tests/Core/Routing/UrlGeneratorTest.php
@@ -5,7 +5,7 @@
 use Drupal\Core\Cache\Cache;
 use Drupal\Core\DependencyInjection\ContainerBuilder;
 use Drupal\Core\PathProcessor\OutboundPathProcessorInterface;
-use Drupal\Core\PathProcessor\PathProcessorAlias;
+use Drupal\path\PathProcessor\AliasPathProcessor;
 use Drupal\Core\PathProcessor\PathProcessorManager;
 use Drupal\Core\Render\BubbleableMetadata;
 use Drupal\Core\Routing\RequestContext;
@@ -43,7 +43,7 @@ class UrlGeneratorTest extends UnitTestCase {
   /**
    * The alias manager.
    *
-   * @var \Drupal\Core\Path\AliasManager|\PHPUnit\Framework\MockObject\MockObject
+   * @var \Drupal\path\AliasManager|\PHPUnit\Framework\MockObject\MockObject
    */
   protected $aliasManager;
 
@@ -143,7 +143,7 @@ protected function setUp() {
       ->will($this->returnValueMap($routes_names_return_map));
 
     // Create an alias manager stub.
-    $alias_manager = $this->getMockBuilder('Drupal\Core\Path\AliasManager')
+    $alias_manager = $this->getMockBuilder('Drupal\path\AliasManager')
       ->disableOriginalConstructor()
       ->getMock();
 
@@ -160,7 +160,7 @@ protected function setUp() {
     $this->context = new RequestContext();
     $this->context->fromRequestStack($this->requestStack);
 
-    $processor = new PathProcessorAlias($this->aliasManager);
+    $processor = new AliasPathProcessor($this->aliasManager);
     $processor_manager = new PathProcessorManager();
     $processor_manager->addOutbound($processor, 1000);
     $this->processorManager = $processor_manager;
diff --git a/core/tests/Drupal/Tests/Core/UrlTest.php b/core/tests/Drupal/Tests/Core/UrlTest.php
index 4094a48d57..8262118f8d 100644
--- a/core/tests/Drupal/Tests/Core/UrlTest.php
+++ b/core/tests/Drupal/Tests/Core/UrlTest.php
@@ -42,7 +42,7 @@ class UrlTest extends UnitTestCase {
   /**
    * The path alias manager.
    *
-   * @var \Drupal\Core\Path\AliasManagerInterface|\PHPUnit\Framework\MockObject\MockObject
+   * @var \Drupal\path\AliasManagerInterface|\PHPUnit\Framework\MockObject\MockObject
    */
   protected $pathAliasManager;
 
@@ -101,7 +101,7 @@ protected function setUp() {
       ->method('generateFromRoute')
       ->will($this->returnValueMap($generate_from_route_map));
 
-    $this->pathAliasManager = $this->createMock('Drupal\Core\Path\AliasManagerInterface');
+    $this->pathAliasManager = $this->createMock('Drupal\path\AliasManagerInterface');
     $this->pathAliasManager->expects($this->any())
       ->method('getPathByAlias')
       ->will($this->returnValueMap($alias_map));