diff --git a/core/lib/Drupal/Core/Config/Config.php b/core/lib/Drupal/Core/Config/Config.php
index eed4f89..93e7898 100644
--- a/core/lib/Drupal/Core/Config/Config.php
+++ b/core/lib/Drupal/Core/Config/Config.php
@@ -70,6 +70,13 @@ class Config {
   protected $data;
 
   /**
+   * The original data of the configuration object.
+   *
+   * @var array
+   */
+  protected $originalData;
+
+  /**
    * The current runtime data.
    *
    * The configuration data from storage merged with language, module and
@@ -160,6 +167,7 @@ public function initWithData(array $data) {
     $this->moduleOverrides = array();
     $this->isNew = FALSE;
     $this->replaceData($data);
+    $this->originalData = $this->data;
     return $this;
   }
 
@@ -467,6 +475,7 @@ public function load() {
       $this->isNew = FALSE;
       $this->replaceData($data);
     }
+    $this->originalData = $this->data;
     $this->isLoaded = TRUE;
     return $this;
   }
@@ -496,7 +505,8 @@ public function save() {
     }
     $this->storage->write($this->name, $this->data);
     $this->isNew = FALSE;
-    $this->notify('save');
+    $this->notify(ConfigEvents::SAVE);
+    $this->originalData = $this->data;
     return $this;
   }
 
@@ -512,7 +522,8 @@ public function delete() {
     $this->storage->delete($this->name);
     $this->isNew = TRUE;
     $this->resetOverriddenData();
-    $this->notify('delete');
+    $this->notify(ConfigEvents::DELETE);
+    $this->originalData = $this->data;
     return $this;
   }
 
@@ -533,7 +544,7 @@ public function getStorage() {
    *   The configuration event name.
    */
   protected function notify($config_event_name) {
-    $this->eventDispatcher->dispatch('config.' . $config_event_name, new ConfigEvent($this));
+    $this->eventDispatcher->dispatch($config_event_name, new ConfigEvent($this));
   }
 
   /**
@@ -650,5 +661,44 @@ public function getRawData() {
     return $this->data;
   }
 
+  /**
+   * Gets original data from this configuration object.
+   *
+   * @see \Drupal\Core\Config\Config::get()
+   *
+   * @return mixed
+   *   The data that was requested.
+   */
+  public function getOriginal($key = '') {
+    if (!$this->isLoaded) {
+      $this->load();
+    }
+
+    // Apply overrides.
+    $original_data = $this->originalData;
+    if (isset($this->languageOverrides) && is_array($this->languageOverrides)) {
+      $original_data = NestedArray::mergeDeepArray(array($original_data, $this->languageOverrides), TRUE);
+    }
+    if (isset($this->moduleOverrides) && is_array($this->moduleOverrides)) {
+      $original_data = NestedArray::mergeDeepArray(array($original_data, $this->moduleOverrides), TRUE);
+    }
+    if (isset($this->settingsOverrides) && is_array($this->settingsOverrides)) {
+      $original_data = NestedArray::mergeDeepArray(array($original_data, $this->settingsOverrides), TRUE);
+    }
+
+    if (empty($key)) {
+      return $original_data;
+    }
+    else {
+      $parts = explode('.', $key);
+      if (count($parts) == 1) {
+        return isset($original_data[$key]) ? $original_data[$key] : NULL;
+      }
+      else {
+        $value = NestedArray::getValue($original_data, $parts, $key_exists);
+        return $key_exists ? $value : NULL;
+      }
+    }
+  }
 }
 
diff --git a/core/lib/Drupal/Core/Config/ConfigEvent.php b/core/lib/Drupal/Core/Config/ConfigEvent.php
index 5b07098..07ef9ec 100644
--- a/core/lib/Drupal/Core/Config/ConfigEvent.php
+++ b/core/lib/Drupal/Core/Config/ConfigEvent.php
@@ -1,10 +1,15 @@
 <?php
 
+/**
+ * @file
+ * Contains \Drupal\Core\Config\ConfigEvent.
+ */
+
 namespace Drupal\Core\Config;
 
 use Symfony\Component\EventDispatcher\Event;
 
-class ConfigEvent extends Event {
+class ConfigEvent extends Event implements ConfigEventInterface {
 
   /**
    * Configuration object.
@@ -24,10 +29,17 @@ public function __construct(Config $config) {
   }
 
   /**
-   * Get configuration object.
+   * {@inheritdoc}
    */
   public function getConfig() {
     return $this->config;
   }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function changed($key) {
+    return $this->config->get($key) === $this->config->getOriginal($key);
+  }
 }
 
diff --git a/core/lib/Drupal/Core/Config/ConfigEventInterface.php b/core/lib/Drupal/Core/Config/ConfigEventInterface.php
new file mode 100644
index 0000000..e047fa0
--- /dev/null
+++ b/core/lib/Drupal/Core/Config/ConfigEventInterface.php
@@ -0,0 +1,29 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Core\Config\ConfigEventInterface.
+ */
+
+namespace Drupal\Core\Config;
+
+interface ConfigEventInterface {
+
+  /**
+   * Gets configuration object.
+   *
+   * @return \Drupal\Core\Config\Config
+   *   The configuration object that caused the event to fire.
+   */
+  public function getConfig();
+
+  /**
+   * Checks to see if the provided configuration key's value has changed.
+   *
+   * @param string $key
+   *   The configuration key to check if it has changed.
+   *
+   * @return bool
+   */
+  public function changed($key);
+}
diff --git a/core/lib/Drupal/Core/Config/ConfigEvents.php b/core/lib/Drupal/Core/Config/ConfigEvents.php
new file mode 100644
index 0000000..c16afc1
--- /dev/null
+++ b/core/lib/Drupal/Core/Config/ConfigEvents.php
@@ -0,0 +1,34 @@
+<?php
+/**
+ * Created by PhpStorm.
+ * User: alex
+ * Date: 17/01/2014
+ * Time: 15:24
+ */
+
+namespace Drupal\Core\Config;
+
+
+class ConfigEvents {
+
+  /**
+   * @see \Drupal\Core\Config\Config::save()
+   */
+  const SAVE = 'config.save';
+
+  /**
+   * @see \Drupal\Core\Config\Config::delete()
+   */
+  const DELETE = 'config.delete';
+
+  /**
+   * @see \Drupal\Core\Config\ConfigFactory::loadModuleOverrides()
+   */
+  const MODULE_OVERRIDES = 'config.module.overrides';
+
+  /**
+   * @see \Drupal\Core\Config\ConfigFactory::rename()
+   */
+  const RENAME = 'config.rename';
+
+}
\ No newline at end of file
diff --git a/core/lib/Drupal/Core/Config/ConfigFactory.php b/core/lib/Drupal/Core/Config/ConfigFactory.php
index 8aeb301..21f4533 100644
--- a/core/lib/Drupal/Core/Config/ConfigFactory.php
+++ b/core/lib/Drupal/Core/Config/ConfigFactory.php
@@ -257,7 +257,7 @@ public function loadMultiple(array $names) {
    */
   protected function loadModuleOverrides(array $names) {
     $configOverridesEvent = new ConfigModuleOverridesEvent($names, $this->language);
-    $this->eventDispatcher->dispatch('config.module.overrides', $configOverridesEvent);
+    $this->eventDispatcher->dispatch(ConfigEvents::MODULE_OVERRIDES, $configOverridesEvent);
     return $configOverridesEvent->getOverrides();
   }
 
@@ -307,10 +307,11 @@ public function rename($old_name, $new_name) {
       unset($this->cache[$old_cache_key]);
     }
 
-    $new_cache_key = $this->getCacheKey($new_name);
-    $this->cache[$new_cache_key] = new Config($new_name, $this->storage, $this->eventDispatcher, $this->typedConfigManager, $this->language);
-    $this->cache[$new_cache_key]->load();
-    return $this->cache[$new_cache_key];
+    // Prime the cache and laod the configuration with the correct overrides.
+    $config = $this->get($new_name);
+    $this->eventDispatcher->dispatch(ConfigEvents::RENAME, new ConfigRenameEvent($config, $old_name));
+
+    return $config;
   }
 
   /**
@@ -467,7 +468,7 @@ public function onConfigSave(ConfigEvent $event) {
    * {@inheritdoc}
    */
   static function getSubscribedEvents() {
-    $events['config.save'][] = array('onConfigSave', 255);
+    $events[ConfigEvents::SAVE][] = array('onConfigSave', 255);
     return $events;
   }
 
diff --git a/core/lib/Drupal/Core/Config/ConfigRenameEvent.php b/core/lib/Drupal/Core/Config/ConfigRenameEvent.php
new file mode 100644
index 0000000..e4e4ffc
--- /dev/null
+++ b/core/lib/Drupal/Core/Config/ConfigRenameEvent.php
@@ -0,0 +1,42 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Core\Config\ConfigRenameEvent.
+ */
+
+namespace Drupal\Core\Config;
+
+class ConfigRenameEvent extends ConfigEvent {
+
+  /**
+   * The old configuration object name.
+   *
+   * @var string
+   */
+  protected $oldName;
+
+  /**
+   * Constructs the config rename event.
+   *
+   * @param \Drupal\Core\Config\Config $confg
+   *   The configuration that has been renamed.
+   * @param $old_name
+   *   The old configuration object name.
+   */
+  public function __construct(Config $confg, $old_name) {
+    $this->config = $confg;
+    $this->oldName = $old_name;
+  }
+
+  /**
+   * Gets the old configuration object name.
+   *
+   * @return string
+   *   The old configuration object name.
+   */
+  public function getOldName() {
+    return $this->oldName;
+  }
+
+}
diff --git a/core/modules/config/lib/Drupal/config/Tests/ConfigEventsTest.php b/core/modules/config/lib/Drupal/config/Tests/ConfigEventsTest.php
new file mode 100644
index 0000000..38d2d31
--- /dev/null
+++ b/core/modules/config/lib/Drupal/config/Tests/ConfigEventsTest.php
@@ -0,0 +1,90 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\config\Tests\ConfigEventsTest.
+ */
+
+namespace Drupal\config\Tests;
+
+use Drupal\Core\Config\Config;
+use Drupal\Core\Config\ConfigEvents;
+use Drupal\simpletest\DrupalUnitTestBase;
+
+
+/**
+ * Tests CRUD operations on configuration objects.
+ */
+class ConfigEventsTest extends DrupalUnitTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = array('config_events_test');
+
+  public static function getInfo() {
+    return array(
+      'name' => 'Config events',
+      'description' => 'Tests events fired on configuration objects.',
+      'group' => 'Configuration',
+    );
+  }
+
+  /**
+   * Tests configuration events.
+   */
+  function testConfigEvents() {
+
+    $name = 'config_events_test.test';
+
+    $config = new Config($name, \Drupal::service('config.storage'), \Drupal::service('event_dispatcher'), \Drupal::service('config.typed'));
+    $config->set('key', 'initial');
+    \Drupal::state()->get('config_events_test.event', FALSE);
+    $this->assertIdentical(\Drupal::state()->get('config_events_test.event', array()), array(), 'No events fired by creating a new configuration object');
+    $config->save();
+
+    $event = \Drupal::state()->get('config_events_test.event', array());
+    $this->assertIdentical($event['event_name'], ConfigEvents::SAVE);
+    $this->assertIdentical($event['current_config_data'], array('key' => 'initial'));
+    $this->assertIdentical($event['raw_config_data'], array('key' => 'initial'));
+    $this->assertIdentical($event['original_config_data'], array());
+
+    $config->set('key', 'updated')->save();
+    $event = \Drupal::state()->get('config_events_test.event', array());
+    $this->assertIdentical($event['event_name'], ConfigEvents::SAVE);
+    $this->assertIdentical($event['current_config_data'], array('key' => 'updated'));
+    $this->assertIdentical($event['raw_config_data'], array('key' => 'updated'));
+    $this->assertIdentical($event['original_config_data'], array('key' => 'initial'));
+
+    $config->delete();
+    $event = \Drupal::state()->get('config_events_test.event', array());
+    $this->assertIdentical($event['event_name'], ConfigEvents::DELETE);
+    $this->assertIdentical($event['current_config_data'], array());
+    $this->assertIdentical($event['raw_config_data'], array());
+    $this->assertIdentical($event['original_config_data'], array('key' => 'updated'));
+  }
+
+  /**
+   * Tests configuration rename event that is fired from the ConfigFactory.
+   */
+  function testConfigRenameEvent() {
+    $name = 'config_events_test.test';
+    $new_name = 'config_events_test.test_rename';
+
+    $config = \Drupal::config($name);
+    $config->set('key', 'initial')->save();
+    $event = \Drupal::state()->get('config_events_test.event', array());
+    $this->assertIdentical($event['event_name'], ConfigEvents::SAVE);
+
+    \Drupal::configFactory()->rename($name, $new_name);
+    $event = \Drupal::state()->get('config_events_test.event', array());
+    $this->assertIdentical($event['event_name'], ConfigEvents::RENAME);
+    $this->assertIdentical($event['current_config_data'], array('key' => 'initial'));
+    $this->assertIdentical($event['raw_config_data'], array('key' => 'initial'));
+    $this->assertIdentical($event['original_config_data'], array('key' => 'initial'));
+  }
+
+
+}
diff --git a/core/modules/config/tests/config_events_test/config_events_test.info.yml b/core/modules/config/tests/config_events_test/config_events_test.info.yml
new file mode 100644
index 0000000..6cb7504
--- /dev/null
+++ b/core/modules/config/tests/config_events_test/config_events_test.info.yml
@@ -0,0 +1,6 @@
+name: 'Configuration events test'
+type: module
+package: Testing
+version: VERSION
+core: 8.x
+hidden: true
diff --git a/core/modules/config/tests/config_events_test/config_events_test.module b/core/modules/config/tests/config_events_test/config_events_test.module
new file mode 100644
index 0000000..aa52475
--- /dev/null
+++ b/core/modules/config/tests/config_events_test/config_events_test.module
@@ -0,0 +1,6 @@
+<?php
+
+/**
+ * @file
+ * Provides Config event listeners for testing purposes.
+ */
diff --git a/core/modules/config/tests/config_events_test/config_events_test.services.yml b/core/modules/config/tests/config_events_test/config_events_test.services.yml
new file mode 100644
index 0000000..12d6fb1
--- /dev/null
+++ b/core/modules/config/tests/config_events_test/config_events_test.services.yml
@@ -0,0 +1,6 @@
+services:
+  config_events_test.event_subscriber:
+    class: Drupal\config_events_test\EventSubscriber
+    arguments: ['@state']
+    tags:
+      - { name: event_subscriber }
diff --git a/core/modules/config/tests/config_events_test/lib/Drupal/config_events_test/EventSubscriber.php b/core/modules/config/tests/config_events_test/lib/Drupal/config_events_test/EventSubscriber.php
new file mode 100644
index 0000000..de919ce
--- /dev/null
+++ b/core/modules/config/tests/config_events_test/lib/Drupal/config_events_test/EventSubscriber.php
@@ -0,0 +1,61 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\config_events_test\EventSubscriber.
+ */
+
+namespace Drupal\config_events_test;
+
+
+use Drupal\Core\Config\ConfigEvent;
+use Drupal\Core\Config\ConfigEvents;
+use Drupal\Core\KeyValueStore\StateInterface;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+
+class EventSubscriber implements EventSubscriberInterface {
+
+
+  /**
+   * The state key value store.
+   *
+   * @var \Drupal\Core\KeyValueStore\StateInterface
+   */
+  protected $state;
+
+  /**
+   * Constructs the Event Subscriber object.
+   *
+   * @param \Drupal\Core\KeyValueStore\StateInterface $state
+   *   The state key value store.
+   */
+  public function __construct(StateInterface $state) {
+    $this->state = $state;
+  }
+
+  /**
+   * Reacts to config event.
+   *
+   * @param \Drupal\Core\Config\ConfigEvent $event
+   *   The configuration event.
+   */
+  public function configEventRecorder(ConfigEvent $event) {
+    $config = $event->getConfig();
+    $this->state->set('config_events_test.event', array(
+      'event_name' => $event->getName(),
+      'current_config_data' => $config->get(),
+      'original_config_data' => $config->getOriginal(),
+      'raw_config_data' => $config->getRawData()
+    ));
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  static function getSubscribedEvents() {
+    $events[ConfigEvents::SAVE][] = array('configEventRecorder');
+    $events[ConfigEvents::DELETE][] = array('configEventRecorder');
+    $events[ConfigEvents::RENAME][] = array('configEventRecorder');
+    return $events;
+  }
+} 
\ No newline at end of file
diff --git a/core/modules/config/tests/config_override/lib/Drupal/config_override/EventSubscriber/ConfigModuleLowPriorityOverrideSubscriber.php b/core/modules/config/tests/config_override/lib/Drupal/config_override/EventSubscriber/ConfigModuleLowPriorityOverrideSubscriber.php
index 1e1b5ef..fd7e26c 100644
--- a/core/modules/config/tests/config_override/lib/Drupal/config_override/EventSubscriber/ConfigModuleLowPriorityOverrideSubscriber.php
+++ b/core/modules/config/tests/config_override/lib/Drupal/config_override/EventSubscriber/ConfigModuleLowPriorityOverrideSubscriber.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\config_override\EventSubscriber;
 
+use Drupal\Core\Config\ConfigEvents;
 use Drupal\Core\Config\ConfigModuleOverridesEvent;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 
@@ -36,7 +37,7 @@ public function onConfigModuleOverride(ConfigModuleOverridesEvent $event) {
    *   An array of event listener definitions.
    */
   static function getSubscribedEvents() {
-    $events['config.module.overrides'][] = array('onConfigModuleOverride', 35);
+    $events[ConfigEvents::MODULE_OVERRIDES][] = array('onConfigModuleOverride', 35);
     return $events;
   }
 }
diff --git a/core/modules/config/tests/config_override/lib/Drupal/config_override/EventSubscriber/ConfigModuleOverrideSubscriber.php b/core/modules/config/tests/config_override/lib/Drupal/config_override/EventSubscriber/ConfigModuleOverrideSubscriber.php
index 54f0f64..e168111 100644
--- a/core/modules/config/tests/config_override/lib/Drupal/config_override/EventSubscriber/ConfigModuleOverrideSubscriber.php
+++ b/core/modules/config/tests/config_override/lib/Drupal/config_override/EventSubscriber/ConfigModuleOverrideSubscriber.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\config_override\EventSubscriber;
 
+use Drupal\Core\Config\ConfigEvents;
 use Drupal\Core\Config\ConfigModuleOverridesEvent;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 
@@ -34,7 +35,7 @@ public function onConfigModuleOverride(ConfigModuleOverridesEvent $event) {
    *   An array of event listener definitions.
    */
   static function getSubscribedEvents() {
-    $events['config.module.overrides'][] = array('onConfigModuleOverride', 40);
+    $events[ConfigEvents::MODULE_OVERRIDES][] = array('onConfigModuleOverride', 40);
     return $events;
   }
 }