diff --git a/Models/Promotion.php b/Models/Promotion.php
index 9b5e702..862022f 100644
--- a/Models/Promotion.php
+++ b/Models/Promotion.php
@@ -14,6 +14,8 @@ declare(strict_types=1);
 
 namespace Modules\Marketing\Models;
 
+use Modules\Admin\Models\Account;
+use Modules\Admin\Models\NullAccount;
 use Modules\Calendar\Models\Calendar;
 use Modules\Tasks\Models\Task;
 use phpOMS\Localization\Money;
@@ -80,10 +82,10 @@ class Promotion
     /**
      * Created by.
      *
-     * @var int|\Modules\Admin\Models\Account
+     * @var Account
      * @since 1.0.0
      */
-    private $createdBy = 0;
+    private Account $createdBy;
 
     private $tasks = [];
 
@@ -100,6 +102,7 @@ class Promotion
         $this->end   = new \DateTime('now');
         $this->end->modify('+1 month');
         $this->createdAt = new \DateTime('now');
+        $this->createdBy = new NullAccount();
 
         $this->calendar = new Calendar();
 
@@ -486,11 +489,11 @@ class Promotion
     /**
      * Get created by
      *
-     * @return int|\Modules\Admin\Models\Account
+     * @return Account
      *
      * @since 1.0.0
      */
-    public function getCreatedBy()
+    public function getCreatedBy() : Account
     {
         return $this->createdBy;
     }
@@ -498,11 +501,11 @@ class Promotion
     /**
      * Set creator
      *
-     * @param int $createdBy Creator
+     * @param Account $createdBy Creator
      *
      * @since 1.0.0
      */
-    public function setCreatedBy(int $createdBy) : void
+    public function setCreatedBy(Account $createdBy) : void
     {
         $this->createdBy = $createdBy;
     }
diff --git a/Models/PromotionMapper.php b/Models/PromotionMapper.php
index 9f9dda9..c8d4a1a 100644
--- a/Models/PromotionMapper.php
+++ b/Models/PromotionMapper.php
@@ -14,6 +14,7 @@ declare(strict_types=1);
 
 namespace Modules\Marketing\Models;
 
+use Modules\Admin\Models\AccountMapper;
 use Modules\Calendar\Models\CalendarMapper;
 use Modules\Media\Models\MediaMapper;
 use Modules\Tasks\Models\TaskMapper;
@@ -47,7 +48,7 @@ final class PromotionMapper extends DataMapperAbstract
         'marketing_promotion_end'           => ['name' => 'marketing_promotion_end',           'type' => 'DateTime',     'internal' => 'end'],
         'marketing_promotion_progress'      => ['name' => 'marketing_promotion_progress',      'type' => 'int',          'internal' => 'progress'],
         'marketing_promotion_progress_type' => ['name' => 'marketing_promotion_progress_type', 'type' => 'int',          'internal' => 'progressType'],
-        'marketing_promotion_created_by'    => ['name' => 'marketing_promotion_created_by',    'type' => 'int',          'internal' => 'createdBy'],
+        'marketing_promotion_created_by'    => ['name' => 'marketing_promotion_created_by',    'type' => 'int',          'internal' => 'createdBy', 'readonly' => true],
         'marketing_promotion_created_at'    => ['name' => 'marketing_promotion_created_at',    'type' => 'DateTime',     'internal' => 'createdAt', 'readonly' => true],
     ];
 
@@ -85,6 +86,19 @@ final class PromotionMapper extends DataMapperAbstract
         ],
     ];
 
+    /**
+     * Belongs to.
+     *
+     * @var array<string, array{mapper:string, self:string}>
+     * @since 1.0.0
+     */
+    protected static array $belongsTo = [
+        'createdBy' => [
+            'mapper' => AccountMapper::class,
+            'self'   => 'marketing_promotion_created_by',
+        ],
+    ];
+
     /**
      * Primary table.
      *