diff --git a/libraries/src/Application/AdministratorApplication.php b/libraries/src/Application/AdministratorApplication.php
index dc55973faf264..45a9d5ecc6ffa 100644
--- a/libraries/src/Application/AdministratorApplication.php
+++ b/libraries/src/Application/AdministratorApplication.php
@@ -11,6 +11,7 @@
 
 use Joomla\Application\Web\WebClient;
 use Joomla\CMS\Component\ComponentHelper;
+use Joomla\CMS\Event\Application\AfterInitialiseDocumentEvent;
 use Joomla\CMS\Factory;
 use Joomla\CMS\Filter\InputFilter;
 use Joomla\CMS\Input\Input;
@@ -137,11 +138,17 @@ public function dispatch($component = null)
         $document->setDescription($this->get('MetaDesc'));
         $document->setGenerator('Joomla! - Open Source Content Management');
 
+        // Trigger the onAfterInitialiseDocument event.
+        PluginHelper::importPlugin('system', null, true, $this->getDispatcher());
+        $this->dispatchEvent(
+            'onAfterInitialiseDocument',
+            new AfterInitialiseDocumentEvent('onAfterInitialiseDocument', ['subject' => $this, 'document' => $document])
+        );
+
         $contents = ComponentHelper::renderComponent($component);
         $document->setBuffer($contents, ['type' => 'component']);
 
         // Trigger the onAfterDispatch event.
-        PluginHelper::importPlugin('system');
         $this->triggerEvent('onAfterDispatch');
     }
 
diff --git a/libraries/src/Application/ApiApplication.php b/libraries/src/Application/ApiApplication.php
index 6f49d90d8b769..83f2dab317fa3 100644
--- a/libraries/src/Application/ApiApplication.php
+++ b/libraries/src/Application/ApiApplication.php
@@ -12,6 +12,7 @@
 use Joomla\Application\Web\WebClient;
 use Joomla\CMS\Access\Exception\AuthenticationFailed;
 use Joomla\CMS\Component\ComponentHelper;
+use Joomla\CMS\Event\Application\AfterInitialiseDocumentEvent;
 use Joomla\CMS\Factory;
 use Joomla\CMS\Plugin\PluginHelper;
 use Joomla\CMS\Router\ApiRouter;
@@ -412,11 +413,16 @@ public function dispatch($component = null)
         // Set up the params
         $document = Factory::getDocument();
 
+        // Trigger the onAfterInitialiseDocument event.
+        $this->dispatchEvent(
+            'onAfterInitialiseDocument',
+            new AfterInitialiseDocumentEvent('onAfterInitialiseDocument', ['subject' => $this, 'document' => $document])
+        );
+
         $contents = ComponentHelper::renderComponent($component);
         $document->setBuffer($contents, ['type' => 'component']);
 
         // Trigger the onAfterDispatch event.
-        PluginHelper::importPlugin('system');
         $this->triggerEvent('onAfterDispatch');
     }
 }
diff --git a/libraries/src/Application/SiteApplication.php b/libraries/src/Application/SiteApplication.php
index c4898a0f1a858..fec7e795894eb 100644
--- a/libraries/src/Application/SiteApplication.php
+++ b/libraries/src/Application/SiteApplication.php
@@ -13,6 +13,7 @@
 use Joomla\CMS\Cache\CacheControllerFactoryAwareTrait;
 use Joomla\CMS\Cache\Controller\OutputController;
 use Joomla\CMS\Component\ComponentHelper;
+use Joomla\CMS\Event\Application\AfterInitialiseDocumentEvent;
 use Joomla\CMS\Factory;
 use Joomla\CMS\Filter\InputFilter;
 use Joomla\CMS\Input\Input;
@@ -205,11 +206,17 @@ public function dispatch($component = null)
             $document->setGenerator('Joomla! - Open Source Content Management');
         }
 
+        // Trigger the onAfterInitialiseDocument event.
+        PluginHelper::importPlugin('system', null, true, $this->getDispatcher());
+        $this->dispatchEvent(
+            'onAfterInitialiseDocument',
+            new AfterInitialiseDocumentEvent('onAfterInitialiseDocument', ['subject' => $this, 'document' => $document])
+        );
+
         $contents = ComponentHelper::renderComponent($component);
         $document->setBuffer($contents, ['type' => 'component']);
 
         // Trigger the onAfterDispatch event.
-        PluginHelper::importPlugin('system');
         $this->triggerEvent('onAfterDispatch');
     }
 
diff --git a/libraries/src/Event/Application/AfterInitialiseDocumentEvent.php b/libraries/src/Event/Application/AfterInitialiseDocumentEvent.php
new file mode 100644
index 0000000000000..44da371c708e8
--- /dev/null
+++ b/libraries/src/Event/Application/AfterInitialiseDocumentEvent.php
@@ -0,0 +1,23 @@
+<?php
+
+/**
+ * Joomla! Content Management System
+ *
+ * @copyright  (C) 2023 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license    GNU General Public License version 2 or later; see LICENSE
+ */
+
+namespace Joomla\CMS\Event\Application;
+
+// phpcs:disable PSR1.Files.SideEffects
+\defined('JPATH_PLATFORM') or die;
+// phpcs:enable PSR1.Files.SideEffects
+
+/**
+ * Event class for AfterInitialiseDocument event
+ *
+ * @since  __DEPLOY_VERSION__
+ */
+class AfterInitialiseDocumentEvent extends ApplicationDocumentEvent
+{
+}
diff --git a/libraries/src/Exception/ExceptionHandler.php b/libraries/src/Exception/ExceptionHandler.php
index bcc4003716e52..d9a4c9a12a5bf 100644
--- a/libraries/src/Exception/ExceptionHandler.php
+++ b/libraries/src/Exception/ExceptionHandler.php
@@ -11,6 +11,7 @@
 
 use Joomla\CMS\Application\CMSApplication;
 use Joomla\CMS\Error\AbstractRenderer;
+use Joomla\CMS\Event\Application\AfterInitialiseDocumentEvent;
 use Joomla\CMS\Factory;
 use Joomla\CMS\Log\Log;
 
@@ -118,6 +119,15 @@ public static function render(\Throwable $error)
             Factory::$document = $renderer->getDocument();
             Factory::getApplication()->loadDocument(Factory::$document);
 
+            // Trigger the onAfterInitialiseDocument event.
+            $app->getDispatcher()->dispatch(
+                'onAfterInitialiseDocument',
+                new AfterInitialiseDocumentEvent('onAfterInitialiseDocument', [
+                    'subject'  => $app,
+                    'document' => $renderer->getDocument(),
+                ])
+            );
+
             $data = $renderer->render($error);
 
             // If nothing was rendered, just use the message from the Exception