diff --git a/docs/pages/UPGRADE-4.0.md b/docs/pages/UPGRADE-4.0.md
index 25749dcd7..28ea17508 100644
--- a/docs/pages/UPGRADE-4.0.md
+++ b/docs/pages/UPGRADE-4.0.md
@@ -1,5 +1,13 @@
 # Upgrade 4.0
 
+## Aggregates
+
+### Child Aggregate
+
+We removed our experimental feature of child aggregates. 
+This was our first attempt to split aggregates into smaller parts,
+but we found a better way to do this with the `Micro Aggregate` feature.
+
 ## Subscription
 
 The constructor of the `DefaultSubscriptionEngine` class has been changed.
diff --git a/docs/pages/aggregate.md b/docs/pages/aggregate.md
index a04efcde4..96c5ba687 100644
--- a/docs/pages/aggregate.md
+++ b/docs/pages/aggregate.md
@@ -653,7 +653,7 @@ Or for test purposes the `FrozenClock`, which always returns the same time.
 
 In some cases, it makes sense to split an aggregate into several smaller aggregates.
 This can be the case if the aggregate becomes too large or if the aggregate is used in different contexts.
-We currently support two patterns for this: Micro Aggregates and Child Aggregates (experimental).
+For these cases you can use Micro Aggregates.
 
 ### Micro Aggregates
 
@@ -740,96 +740,7 @@ final class Shipping extends BasicAggregateRoot
     }
 }
 ```
-### Child Aggregates
 
-??? example "Experimental"
-
-    This feature is still experimental and may change in the future.
-    Use it with caution.
-    
-Another way to split an aggregate is to use child aggregates.
-The difference to Micro Aggregates, child aggregates can only be accessed by the root aggregate
-and are not separate aggregates.
-
-In the following example, we have an `Order` aggregate that has a `Shipping` child aggregate.
-
-```php
-use Patchlevel\EventSourcing\Aggregate\BasicChildAggregate;
-use Patchlevel\EventSourcing\Attribute\Apply;
-
-final class Shipping extends BasicChildAggregate
-{
-    private bool $arrived = false;
-
-    public function __construct(
-        private string $trackingId,
-    ) {
-    }
-
-    public function arrive(): void
-    {
-        $this->recordThat(new Arrived());
-    }
-
-    #[Apply]
-    public function applyArrived(Arrived $event): void
-    {
-        $this->arrived = true;
-    }
-
-    public function isArrived(): bool
-    {
-        return $this->arrived;
-    }
-}
-```
-!!! warning
-
-    The apply method must be public, otherwise the root aggregate cannot call it.
-    
-!!! note
-
-    Supress missing apply methods need to be defined in the root aggregate.
-    
-And the `Order` aggregate root looks like this:
-
-```php
-use Patchlevel\EventSourcing\Aggregate\BasicAggregateRoot;
-use Patchlevel\EventSourcing\Aggregate\Uuid;
-use Patchlevel\EventSourcing\Attribute\Aggregate;
-use Patchlevel\EventSourcing\Attribute\Apply;
-use Patchlevel\EventSourcing\Attribute\ChildAggregate;
-use Patchlevel\EventSourcing\Attribute\Id;
-
-#[Aggregate('order')]
-final class Order extends BasicAggregateRoot
-{
-    #[Id]
-    private Uuid $id;
-
-    #[ChildAggregate]
-    private Shipping $shipping;
-
-    public static function create(Uuid $id, string $trackingId): static
-    {
-        $self = new static();
-        $self->recordThat(new OrderCreated($id, $trackingId));
-
-        return $self;
-    }
-
-    #[Apply]
-    public function applyOrderCreated(OrderCreated $event): void
-    {
-        $this->shipping = new Shipping($event->trackingId);
-    }
-
-    public function arrive(): void
-    {
-        $this->shipping->arrive();
-    }
-}
-```
 ## Aggregate Root Registry
 
 The library needs to know about all aggregates so that the correct aggregate class is used to load from the database.
diff --git a/src/Aggregate/AggregateRootAttributeBehaviour.php b/src/Aggregate/AggregateRootAttributeBehaviour.php
index 075c2bd0f..c8be85875 100644
--- a/src/Aggregate/AggregateRootAttributeBehaviour.php
+++ b/src/Aggregate/AggregateRootAttributeBehaviour.php
@@ -5,12 +5,9 @@
 namespace Patchlevel\EventSourcing\Aggregate;
 
 use Patchlevel\Hydrator\Attribute\Ignore;
-use Patchlevel\Hydrator\Attribute\PostHydrate;
 use ReflectionProperty;
 
 use function array_key_exists;
-use function count;
-use function explode;
 
 trait AggregateRootAttributeBehaviour
 {
@@ -20,10 +17,6 @@ trait AggregateRootAttributeBehaviour
     #[Ignore]
     private AggregateRootId|null $cachedAggregateRootId = null;
 
-    /** @var (callable(object $event): void)|null */
-    #[Ignore]
-    private $recorder = null;
-
     protected function apply(object $event): void
     {
         $metadata = static::metadata();
@@ -38,58 +31,7 @@ protected function apply(object $event): void
 
         $method = $metadata->applyMethods[$event::class];
 
-        if ($metadata->childAggregates === []) {
-            $this->$method($event);
-
-            return;
-        }
-
-        $parts = explode('.', $method);
-
-        if (count($parts) === 2) {
-            [$property, $method] = $parts;
-
-            $child = $this->getChildAggregateByPropertyName($property);
-
-            if ($child !== null) {
-                $child->$method($event);
-            }
-        } else {
-            $this->$method($event);
-        }
-
-        $this->passRecorderToChildAggregates();
-    }
-
-    #[PostHydrate]
-    private function passRecorderToChildAggregates(): void
-    {
-        $metadata = static::metadata();
-        $this->recorder ??= $this->recordThat(...);
-
-        foreach ($metadata->childAggregates as $propertyName) {
-            $child = $this->getChildAggregateByPropertyName($propertyName);
-
-            if ($child === null) {
-                continue;
-            }
-
-            $child->setRecorder($this->recorder);
-        }
-    }
-
-    private function getChildAggregateByPropertyName(string $propertyName): ChildAggregate|null
-    {
-        $reflectionProperty = new ReflectionProperty($this::class, $propertyName);
-
-        if (!$reflectionProperty->isInitialized($this)) {
-            return null;
-        }
-
-        /** @var ChildAggregate|null $child */
-        $child = $reflectionProperty->getValue($this);
-
-        return $child;
+        $this->$method($event);
     }
 
     public function aggregateRootId(): AggregateRootId
diff --git a/src/Aggregate/BasicChildAggregate.php b/src/Aggregate/BasicChildAggregate.php
deleted file mode 100644
index 526db4473..000000000
--- a/src/Aggregate/BasicChildAggregate.php
+++ /dev/null
@@ -1,14 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Patchlevel\EventSourcing\Aggregate;
-
-use Patchlevel\Hydrator\Normalizer\ObjectNormalizer;
-
-/** @experimental  */
-#[ObjectNormalizer]
-abstract class BasicChildAggregate implements ChildAggregate
-{
-    use ChildAggregateBehaviour;
-}
diff --git a/src/Aggregate/ChildAggregate.php b/src/Aggregate/ChildAggregate.php
deleted file mode 100644
index ccc440b51..000000000
--- a/src/Aggregate/ChildAggregate.php
+++ /dev/null
@@ -1,12 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Patchlevel\EventSourcing\Aggregate;
-
-/** @experimental  */
-interface ChildAggregate
-{
-    /** @param callable(object $event): void $recorder */
-    public function setRecorder(callable $recorder): void;
-}
diff --git a/src/Aggregate/ChildAggregateBehaviour.php b/src/Aggregate/ChildAggregateBehaviour.php
deleted file mode 100644
index 898ec5090..000000000
--- a/src/Aggregate/ChildAggregateBehaviour.php
+++ /dev/null
@@ -1,26 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Patchlevel\EventSourcing\Aggregate;
-
-use Patchlevel\Hydrator\Attribute\Ignore;
-
-/** @experimental  */
-trait ChildAggregateBehaviour
-{
-    /** @var callable(object $event): void */
-    #[Ignore]
-    private $recorder;
-
-    protected function recordThat(object $event): void
-    {
-        ($this->recorder)($event);
-    }
-
-    /** @param callable(object $event): void $recorder */
-    public function setRecorder(callable $recorder): void
-    {
-        $this->recorder = $recorder;
-    }
-}
diff --git a/src/Attribute/ChildAggregate.php b/src/Attribute/ChildAggregate.php
deleted file mode 100644
index 6d3f68775..000000000
--- a/src/Attribute/ChildAggregate.php
+++ /dev/null
@@ -1,13 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Patchlevel\EventSourcing\Attribute;
-
-use Attribute;
-
-/** @experimental */
-#[Attribute(Attribute::TARGET_PROPERTY)]
-final class ChildAggregate
-{
-}
diff --git a/src/Metadata/AggregateRoot/AggregateRootMetadata.php b/src/Metadata/AggregateRoot/AggregateRootMetadata.php
index afe79ff98..aec3a2e6d 100644
--- a/src/Metadata/AggregateRoot/AggregateRootMetadata.php
+++ b/src/Metadata/AggregateRoot/AggregateRootMetadata.php
@@ -25,8 +25,6 @@ public function __construct(
         public readonly array $suppressEvents,
         public readonly bool $suppressAll,
         public readonly Snapshot|null $snapshot,
-        /** @var list<string> */
-        public readonly array $childAggregates = [],
         string|null $streamName = null,
     ) {
         $this->streamName = $streamName ?? $this->name . '-{id}';
diff --git a/src/Metadata/AggregateRoot/AttributeAggregateRootMetadataFactory.php b/src/Metadata/AggregateRoot/AttributeAggregateRootMetadataFactory.php
index e622b4910..ffb33075f 100644
--- a/src/Metadata/AggregateRoot/AttributeAggregateRootMetadataFactory.php
+++ b/src/Metadata/AggregateRoot/AttributeAggregateRootMetadataFactory.php
@@ -7,7 +7,6 @@
 use Patchlevel\EventSourcing\Aggregate\AggregateRoot;
 use Patchlevel\EventSourcing\Attribute\Aggregate;
 use Patchlevel\EventSourcing\Attribute\Apply;
-use Patchlevel\EventSourcing\Attribute\ChildAggregate;
 use Patchlevel\EventSourcing\Attribute\Id;
 use Patchlevel\EventSourcing\Attribute\Snapshot as AttributeSnapshot;
 use Patchlevel\EventSourcing\Attribute\Stream;
@@ -17,7 +16,6 @@
 use ReflectionMethod;
 use ReflectionNamedType;
 use ReflectionUnionType;
-use RuntimeException;
 
 use function array_key_exists;
 use function array_map;
@@ -47,9 +45,8 @@ public function metadata(string $aggregate): AggregateRootMetadata
 
         $aggregateName = $this->findAggregateName($reflectionClass);
         $idProperty = $this->findIdProperty($reflectionClass);
-        $childAggregates = $this->findChildAggregates($reflectionClass);
         [$suppressEvents, $suppressAll] = $this->findSuppressMissingApply($reflectionClass);
-        $applyMethods = $this->findApplyMethods($reflectionClass, $aggregate, $childAggregates);
+        $applyMethods = $this->findApplyMethods($reflectionClass, $aggregate);
         $snapshot = $this->findSnapshot($reflectionClass);
 
         $metadata = new AggregateRootMetadata(
@@ -60,7 +57,6 @@ public function metadata(string $aggregate): AggregateRootMetadata
             $suppressEvents,
             $suppressAll,
             $snapshot,
-            array_map(static fn (array $list) => $list[0], $childAggregates),
             $this->findStreamName($reflectionClass),
         );
 
@@ -158,60 +154,17 @@ private function findStreamName(ReflectionClass $reflector): string|null
         return $attributes[0]->newInstance()->name;
     }
 
-    /** @return list<array{string, ReflectionClass}> */
-    private function findChildAggregates(ReflectionClass $reflector): array
-    {
-        $properties = $reflector->getProperties();
-        $childAggregates = [];
-
-        foreach ($properties as $property) {
-            $attributes = $property->getAttributes(ChildAggregate::class);
-
-            if ($attributes === []) {
-                continue;
-            }
-
-            $reflectionType = $property->getType();
-
-            if (!$reflectionType instanceof ReflectionNamedType) {
-                throw new RuntimeException('no intersection / union supported');
-            }
-
-            if (!is_a($reflectionType->getName(), \Patchlevel\EventSourcing\Aggregate\ChildAggregate::class, true)) {
-                throw new RuntimeException('no child');
-            }
-
-            $childAggregates[] = [$property->getName(), new ReflectionClass($reflectionType->getName())];
-        }
-
-        return $childAggregates;
-    }
-
     /**
-     * @param class-string<AggregateRoot>          $aggregate
-     * @param list<array{string, ReflectionClass}> $childAggregates
+     * @param class-string<AggregateRoot> $aggregate
      *
      * @return array<class-string, string>
      */
-    private function findApplyMethods(ReflectionClass $reflector, string $aggregate, array $childAggregates): array
+    private function findApplyMethods(ReflectionClass $reflector, string $aggregate): array
     {
         $applyMethods = [];
 
-        /** @var list<array{string, ReflectionMethod}> $methodList */
-        $methodList = [];
-
-        foreach ($reflector->getMethods() as $method) {
-            $methodList[] = [$method->getName(), $method];
-        }
-
-        foreach ($childAggregates as [$propertyName, $childReflector]) {
-            foreach ($childReflector->getMethods() as $method) {
-                $methodList[] = [$propertyName . '.' . $method->getName(), $method];
-            }
-        }
-
         // process apply methods
-        foreach ($methodList as [$path, $method]) {
+        foreach ($reflector->getMethods() as $method) {
             $attributes = $method->getAttributes(Apply::class);
 
             if ($attributes === []) {
@@ -234,7 +187,7 @@ private function findApplyMethods(ReflectionClass $reflector, string $aggregate,
                 }
 
                 if ($hasOneEmptyApply) {
-                    throw new DuplicateEmptyApplyAttribute($path);
+                    throw new DuplicateEmptyApplyAttribute($method->getName());
                 }
 
                 $hasOneEmptyApply = true;
@@ -242,12 +195,12 @@ private function findApplyMethods(ReflectionClass $reflector, string $aggregate,
             }
 
             if ($hasOneEmptyApply && $hasOneNonEmptyApply) {
-                throw new MixedApplyAttributeUsage($path);
+                throw new MixedApplyAttributeUsage($method->getName());
             }
 
             foreach ($eventClasses as $eventClass) {
                 if (!class_exists($eventClass)) {
-                    throw new ArgumentTypeIsNotAClass($path, $eventClass);
+                    throw new ArgumentTypeIsNotAClass($method->getName(), $eventClass);
                 }
 
                 if (array_key_exists($eventClass, $applyMethods)) {
@@ -255,11 +208,11 @@ private function findApplyMethods(ReflectionClass $reflector, string $aggregate,
                         $aggregate,
                         $eventClass,
                         $applyMethods[$eventClass],
-                        $path,
+                        $method->getName(),
                     );
                 }
 
-                $applyMethods[$eventClass] = $path;
+                $applyMethods[$eventClass] = $method->getName();
             }
         }
 
diff --git a/tests/Integration/ChildAggregate/ChildAggregateIntegrationTest.php b/tests/Integration/ChildAggregate/ChildAggregateIntegrationTest.php
deleted file mode 100644
index df6ddce68..000000000
--- a/tests/Integration/ChildAggregate/ChildAggregateIntegrationTest.php
+++ /dev/null
@@ -1,172 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Patchlevel\EventSourcing\Tests\Integration\ChildAggregate;
-
-use Doctrine\DBAL\Connection;
-use Patchlevel\EventSourcing\Metadata\AggregateRoot\AggregateRootRegistry;
-use Patchlevel\EventSourcing\Repository\DefaultRepositoryManager;
-use Patchlevel\EventSourcing\Schema\DoctrineSchemaDirector;
-use Patchlevel\EventSourcing\Serializer\DefaultEventSerializer;
-use Patchlevel\EventSourcing\Snapshot\Adapter\InMemorySnapshotAdapter;
-use Patchlevel\EventSourcing\Snapshot\DefaultSnapshotStore;
-use Patchlevel\EventSourcing\Store\DoctrineDbalStore;
-use Patchlevel\EventSourcing\Subscription\Engine\DefaultSubscriptionEngine;
-use Patchlevel\EventSourcing\Subscription\Engine\StoreMessageLoader;
-use Patchlevel\EventSourcing\Subscription\Engine\ThrowOnErrorSubscriptionEngine;
-use Patchlevel\EventSourcing\Subscription\Repository\RunSubscriptionEngineRepositoryManager;
-use Patchlevel\EventSourcing\Subscription\Store\InMemorySubscriptionStore;
-use Patchlevel\EventSourcing\Subscription\Subscriber\MetadataSubscriberAccessorRepository;
-use Patchlevel\EventSourcing\Tests\DbalManager;
-use Patchlevel\EventSourcing\Tests\Integration\ChildAggregate\Projection\ProfileProjector;
-use PHPUnit\Framework\Attributes\CoversNothing;
-use PHPUnit\Framework\TestCase;
-
-#[CoversNothing]
-final class ChildAggregateIntegrationTest extends TestCase
-{
-    private Connection $connection;
-
-    public function setUp(): void
-    {
-        $this->connection = DbalManager::createConnection();
-    }
-
-    public function tearDown(): void
-    {
-        $this->connection->close();
-        SendEmailMock::reset();
-    }
-
-    public function testSuccessful(): void
-    {
-        $store = new DoctrineDbalStore(
-            $this->connection,
-            DefaultEventSerializer::createFromPaths([__DIR__ . '/Events']),
-        );
-
-        $profileProjector = new ProfileProjector($this->connection);
-
-        $engine = new ThrowOnErrorSubscriptionEngine(new DefaultSubscriptionEngine(
-            new StoreMessageLoader($store),
-            new InMemorySubscriptionStore(),
-            new MetadataSubscriberAccessorRepository([$profileProjector]),
-        ));
-
-        $manager = new RunSubscriptionEngineRepositoryManager(
-            new DefaultRepositoryManager(
-                new AggregateRootRegistry(['profile' => Profile::class]),
-                $store,
-                null,
-                null,
-            ),
-            $engine,
-        );
-
-        $repository = $manager->get(Profile::class);
-
-        $schemaDirector = new DoctrineSchemaDirector(
-            $this->connection,
-            $store,
-        );
-
-        $schemaDirector->create();
-        $engine->setup(skipBooting: true);
-
-        $profileId = ProfileId::generate();
-        $profile = Profile::create($profileId, 'John');
-        $profile->changeName('Snow');
-        $profile->trackView();
-        $repository->save($profile);
-
-        $result = $this->connection->fetchAssociative(
-            'SELECT * FROM projection_profile WHERE id = ?',
-            [$profileId->toString()],
-        );
-
-        self::assertIsArray($result);
-        self::assertArrayHasKey('id', $result);
-        self::assertSame($profileId->toString(), $result['id']);
-        self::assertSame('Snow', $result['name']);
-
-        $repository = $manager->get(Profile::class);
-        $profile = $repository->load($profileId);
-
-        self::assertInstanceOf(Profile::class, $profile);
-        self::assertEquals($profileId, $profile->aggregateRootId());
-        self::assertSame(3, $profile->playhead());
-        self::assertSame('Snow', $profile->name());
-        self::assertSame(1, $profile->views());
-    }
-
-    public function testSnapshot(): void
-    {
-        $store = new DoctrineDbalStore(
-            $this->connection,
-            DefaultEventSerializer::createFromPaths([__DIR__ . '/Events']),
-        );
-
-        $profileProjection = new ProfileProjector($this->connection);
-
-        $engine = new DefaultSubscriptionEngine(
-            new StoreMessageLoader($store),
-            new InMemorySubscriptionStore(),
-            new MetadataSubscriberAccessorRepository([$profileProjection]),
-        );
-
-        $manager = new RunSubscriptionEngineRepositoryManager(
-            new DefaultRepositoryManager(
-                new AggregateRootRegistry(['profile' => Profile::class]),
-                $store,
-                null,
-                new DefaultSnapshotStore(['default' => new InMemorySnapshotAdapter()]),
-            ),
-            $engine,
-        );
-
-        $repository = $manager->get(Profile::class);
-
-        $schemaDirector = new DoctrineSchemaDirector(
-            $this->connection,
-            $store,
-        );
-
-        $schemaDirector->create();
-        $engine->setup(skipBooting: true);
-
-        $profileId = ProfileId::generate();
-        $profile = Profile::create($profileId, 'John');
-        $repository->save($profile);
-
-        $result = $this->connection->fetchAssociative(
-            'SELECT * FROM projection_profile WHERE id = ?',
-            [$profileId->toString()],
-        );
-
-        self::assertIsArray($result);
-        self::assertArrayHasKey('id', $result);
-        self::assertSame($profileId->toString(), $result['id']);
-        self::assertSame('John', $result['name']);
-
-        $repository = $manager->get(Profile::class);
-
-        // create snapshot
-        $repository->load($profileId);
-
-        // load from snapshot
-        $profile = $repository->load($profileId);
-
-        $profile->changeName('Snow');
-        $profile->trackView();
-        $repository->save($profile);
-
-        $profile = $repository->load($profileId);
-
-        self::assertInstanceOf(Profile::class, $profile);
-        self::assertEquals($profileId, $profile->aggregateRootId());
-        self::assertSame(3, $profile->playhead());
-        self::assertSame('Snow', $profile->name());
-        self::assertSame(1, $profile->views());
-    }
-}
diff --git a/tests/Integration/ChildAggregate/Events/NameChanged.php b/tests/Integration/ChildAggregate/Events/NameChanged.php
deleted file mode 100644
index 75c85e6f5..000000000
--- a/tests/Integration/ChildAggregate/Events/NameChanged.php
+++ /dev/null
@@ -1,16 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Patchlevel\EventSourcing\Tests\Integration\ChildAggregate\Events;
-
-use Patchlevel\EventSourcing\Attribute\Event;
-
-#[Event('profile.name_changed')]
-final class NameChanged
-{
-    public function __construct(
-        public string $name,
-    ) {
-    }
-}
diff --git a/tests/Integration/ChildAggregate/Events/ProfileCreated.php b/tests/Integration/ChildAggregate/Events/ProfileCreated.php
deleted file mode 100644
index ee801f2dc..000000000
--- a/tests/Integration/ChildAggregate/Events/ProfileCreated.php
+++ /dev/null
@@ -1,18 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Patchlevel\EventSourcing\Tests\Integration\ChildAggregate\Events;
-
-use Patchlevel\EventSourcing\Attribute\Event;
-use Patchlevel\EventSourcing\Tests\Integration\ChildAggregate\ProfileId;
-
-#[Event('profile.created')]
-final class ProfileCreated
-{
-    public function __construct(
-        public ProfileId $profileId,
-        public string $name,
-    ) {
-    }
-}
diff --git a/tests/Integration/ChildAggregate/Events/ViewTracked.php b/tests/Integration/ChildAggregate/Events/ViewTracked.php
deleted file mode 100644
index 4864215ed..000000000
--- a/tests/Integration/ChildAggregate/Events/ViewTracked.php
+++ /dev/null
@@ -1,15 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Patchlevel\EventSourcing\Tests\Integration\ChildAggregate\Events;
-
-use Patchlevel\EventSourcing\Attribute\Event;
-
-#[Event('profile.view_tracked')]
-final class ViewTracked
-{
-    public function __construct()
-    {
-    }
-}
diff --git a/tests/Integration/ChildAggregate/PersonalInformation.php b/tests/Integration/ChildAggregate/PersonalInformation.php
deleted file mode 100644
index 89d61a31e..000000000
--- a/tests/Integration/ChildAggregate/PersonalInformation.php
+++ /dev/null
@@ -1,33 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Patchlevel\EventSourcing\Tests\Integration\ChildAggregate;
-
-use Patchlevel\EventSourcing\Aggregate\BasicChildAggregate;
-use Patchlevel\EventSourcing\Attribute\Apply;
-use Patchlevel\EventSourcing\Tests\Integration\ChildAggregate\Events\NameChanged;
-
-final class PersonalInformation extends BasicChildAggregate
-{
-    public function __construct(
-        private string $name,
-    ) {
-    }
-
-    #[Apply(NameChanged::class)]
-    public function applyNameChanged(NameChanged $event): void
-    {
-        $this->name = $event->name;
-    }
-
-    public function name(): string
-    {
-        return $this->name;
-    }
-
-    public function changeName(string $name): void
-    {
-        $this->recordThat(new NameChanged($name));
-    }
-}
diff --git a/tests/Integration/ChildAggregate/Profile.php b/tests/Integration/ChildAggregate/Profile.php
deleted file mode 100644
index c14279fd2..000000000
--- a/tests/Integration/ChildAggregate/Profile.php
+++ /dev/null
@@ -1,63 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Patchlevel\EventSourcing\Tests\Integration\ChildAggregate;
-
-use Patchlevel\EventSourcing\Aggregate\BasicAggregateRoot;
-use Patchlevel\EventSourcing\Attribute\Aggregate;
-use Patchlevel\EventSourcing\Attribute\Apply;
-use Patchlevel\EventSourcing\Attribute\ChildAggregate;
-use Patchlevel\EventSourcing\Attribute\Id;
-use Patchlevel\EventSourcing\Attribute\Snapshot;
-use Patchlevel\EventSourcing\Tests\Integration\ChildAggregate\Events\ProfileCreated;
-
-#[Aggregate('profile')]
-#[Snapshot('default', 1)]
-final class Profile extends BasicAggregateRoot
-{
-    #[Id]
-    private ProfileId $id;
-
-    #[ChildAggregate]
-    protected PersonalInformation $personalInformation;
-
-    #[ChildAggregate]
-    private Views $views;
-
-    public static function create(ProfileId $id, string $name): self
-    {
-        $self = new self();
-        $self->recordThat(new ProfileCreated($id, $name));
-
-        return $self;
-    }
-
-    #[Apply(ProfileCreated::class)]
-    protected function applyProfileCreated(ProfileCreated $event): void
-    {
-        $this->id = $event->profileId;
-        $this->personalInformation = new PersonalInformation($event->name);
-        $this->views = new Views();
-    }
-
-    public function name(): string
-    {
-        return $this->personalInformation->name();
-    }
-
-    public function views(): int
-    {
-        return $this->views->views();
-    }
-
-    public function changeName(string $name): void
-    {
-        $this->personalInformation->changeName($name);
-    }
-
-    public function trackView(): void
-    {
-        $this->views->trackView();
-    }
-}
diff --git a/tests/Integration/ChildAggregate/ProfileId.php b/tests/Integration/ChildAggregate/ProfileId.php
deleted file mode 100644
index 8cbe08456..000000000
--- a/tests/Integration/ChildAggregate/ProfileId.php
+++ /dev/null
@@ -1,13 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Patchlevel\EventSourcing\Tests\Integration\ChildAggregate;
-
-use Patchlevel\EventSourcing\Aggregate\AggregateRootId;
-use Patchlevel\EventSourcing\Aggregate\RamseyUuidV7Behaviour;
-
-final class ProfileId implements AggregateRootId
-{
-    use RamseyUuidV7Behaviour;
-}
diff --git a/tests/Integration/ChildAggregate/Projection/ProfileProjector.php b/tests/Integration/ChildAggregate/Projection/ProfileProjector.php
deleted file mode 100644
index 57dd12331..000000000
--- a/tests/Integration/ChildAggregate/Projection/ProfileProjector.php
+++ /dev/null
@@ -1,63 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Patchlevel\EventSourcing\Tests\Integration\ChildAggregate\Projection;
-
-use Doctrine\DBAL\Connection;
-use Doctrine\DBAL\Schema\Table;
-use Patchlevel\EventSourcing\Attribute\Projector;
-use Patchlevel\EventSourcing\Attribute\Setup;
-use Patchlevel\EventSourcing\Attribute\Subscribe;
-use Patchlevel\EventSourcing\Attribute\Teardown;
-use Patchlevel\EventSourcing\Tests\Integration\ChildAggregate\Events\NameChanged;
-use Patchlevel\EventSourcing\Tests\Integration\ChildAggregate\Events\ProfileCreated;
-use Patchlevel\EventSourcing\Tests\Integration\ChildAggregate\ProfileId;
-
-#[Projector('profile-1')]
-final class ProfileProjector
-{
-    public function __construct(
-        private Connection $connection,
-    ) {
-    }
-
-    #[Setup]
-    public function create(): void
-    {
-        $table = new Table('projection_profile');
-        $table->addColumn('id', 'string')->setLength(36);
-        $table->addColumn('name', 'string')->setLength(255);
-        $table->setPrimaryKey(['id']);
-
-        $this->connection->createSchemaManager()->createTable($table);
-    }
-
-    #[Teardown]
-    public function drop(): void
-    {
-        $this->connection->createSchemaManager()->dropTable('projection_profile');
-    }
-
-    #[Subscribe(ProfileCreated::class)]
-    public function handleProfileCreated(ProfileCreated $profileCreated): void
-    {
-        $this->connection->executeStatement(
-            'INSERT INTO projection_profile (id, name) VALUES(:id, :name);',
-            [
-                'id' => $profileCreated->profileId->toString(),
-                'name' => $profileCreated->name,
-            ],
-        );
-    }
-
-    #[Subscribe(NameChanged::class)]
-    public function handleNameChanged(NameChanged $nameChanged, ProfileId $profileId): void
-    {
-        $this->connection->update(
-            'projection_profile',
-            ['name' => $nameChanged->name],
-            ['id' => $profileId->toString()],
-        );
-    }
-}
diff --git a/tests/Integration/ChildAggregate/SendEmailMock.php b/tests/Integration/ChildAggregate/SendEmailMock.php
deleted file mode 100644
index 7c6047be1..000000000
--- a/tests/Integration/ChildAggregate/SendEmailMock.php
+++ /dev/null
@@ -1,25 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Patchlevel\EventSourcing\Tests\Integration\ChildAggregate;
-
-final class SendEmailMock
-{
-    private static int $count = 0;
-
-    public static function send(): void
-    {
-        self::$count++;
-    }
-
-    public static function count(): int
-    {
-        return self::$count;
-    }
-
-    public static function reset(): void
-    {
-        self::$count = 0;
-    }
-}
diff --git a/tests/Integration/ChildAggregate/Views.php b/tests/Integration/ChildAggregate/Views.php
deleted file mode 100644
index dcca3fc30..000000000
--- a/tests/Integration/ChildAggregate/Views.php
+++ /dev/null
@@ -1,32 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Patchlevel\EventSourcing\Tests\Integration\ChildAggregate;
-
-use Patchlevel\EventSourcing\Aggregate\BasicChildAggregate;
-use Patchlevel\EventSourcing\Attribute\Apply;
-use Patchlevel\EventSourcing\Tests\Integration\ChildAggregate\Events\ViewTracked;
-
-final class Views extends BasicChildAggregate
-{
-    public function __construct(private int $views = 0)
-    {
-    }
-
-    #[Apply(ViewTracked::class)]
-    public function applyNameChanged(ViewTracked $event): void
-    {
-        $this->views++;
-    }
-
-    public function views(): int
-    {
-        return $this->views;
-    }
-
-    public function trackView(): void
-    {
-        $this->recordThat(new ViewTracked());
-    }
-}
diff --git a/tests/Unit/Aggregate/AggregateRootTest.php b/tests/Unit/Aggregate/AggregateRootTest.php
index e6e414b56..aea151bb1 100644
--- a/tests/Unit/Aggregate/AggregateRootTest.php
+++ b/tests/Unit/Aggregate/AggregateRootTest.php
@@ -15,13 +15,8 @@
 use Patchlevel\EventSourcing\Metadata\AggregateRoot\AggregateRootMetadataFactory;
 use Patchlevel\EventSourcing\Metadata\AggregateRoot\DuplicateApplyMethod;
 use Patchlevel\EventSourcing\Tests\Unit\Fixture\Email;
-use Patchlevel\EventSourcing\Tests\Unit\Fixture\ItemAdded;
 use Patchlevel\EventSourcing\Tests\Unit\Fixture\Message;
 use Patchlevel\EventSourcing\Tests\Unit\Fixture\MessageId;
-use Patchlevel\EventSourcing\Tests\Unit\Fixture\Order;
-use Patchlevel\EventSourcing\Tests\Unit\Fixture\OrderCreated;
-use Patchlevel\EventSourcing\Tests\Unit\Fixture\OrderId;
-use Patchlevel\EventSourcing\Tests\Unit\Fixture\PaymentConfirmed;
 use Patchlevel\EventSourcing\Tests\Unit\Fixture\Profile;
 use Patchlevel\EventSourcing\Tests\Unit\Fixture\ProfileCreated;
 use Patchlevel\EventSourcing\Tests\Unit\Fixture\ProfileId;
@@ -209,7 +204,7 @@ public function metadata(string $aggregate): AggregateRootMetadata
             {
                 $this->called = true;
 
-                return new AggregateRootMetadata($aggregate, 'name', 'id', [], [], false, null, []);
+                return new AggregateRootMetadata($aggregate, 'name', 'id', [], [], false, null);
             }
         };
 
@@ -218,47 +213,4 @@ public function metadata(string $aggregate): AggregateRootMetadata
         Profile::getMetadata();
         self::assertTrue($newFactory->called);
     }
-
-    public function testApplyMethodWithMultipleChildren(): void
-    {
-        $id = OrderId::fromString('1');
-        $order = Order::create($id);
-
-        self::assertSame($id, $order->aggregateRootId());
-        self::assertSame(1, $order->playhead());
-        self::assertEquals($id, $order->id());
-        self::assertEquals(0, $order->countItem('foo'));
-        self::assertEquals(0, $order->countItem('bar'));
-        self::assertEquals(0, $order->countAll());
-        self::assertFalse($order->isPayed());
-
-        $events = $order->releaseEvents();
-        self::assertCount(1, $events);
-
-        $event = $events[0];
-
-        self::assertInstanceOf(OrderCreated::class, $event);
-        self::assertEquals($id, $event->orderId);
-
-        $order->addItem('foo', 2);
-        self::assertEquals(2, $order->countItem('foo'));
-        self::assertEquals(0, $order->countItem('bar'));
-        self::assertEquals(2, $order->countAll());
-
-        $order->confirmPayment();
-        self::assertTrue($order->isPayed());
-
-        $events = $order->releaseEvents();
-        self::assertCount(2, $events);
-
-        $event = $events[0];
-
-        self::assertInstanceOf(ItemAdded::class, $event);
-        self::assertEquals('foo', $event->productId);
-        self::assertEquals(2, $event->quantity);
-
-        $event = $events[1];
-
-        self::assertInstanceOf(PaymentConfirmed::class, $event);
-    }
 }
diff --git a/tests/Unit/Fixture/EmptyEvent.php b/tests/Unit/Fixture/EmptyEvent.php
deleted file mode 100644
index 789046af9..000000000
--- a/tests/Unit/Fixture/EmptyEvent.php
+++ /dev/null
@@ -1,9 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Patchlevel\EventSourcing\Tests\Unit\Fixture;
-
-final class EmptyEvent
-{
-}
diff --git a/tests/Unit/Fixture/ItemAdded.php b/tests/Unit/Fixture/ItemAdded.php
deleted file mode 100644
index 5af9ec694..000000000
--- a/tests/Unit/Fixture/ItemAdded.php
+++ /dev/null
@@ -1,17 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Patchlevel\EventSourcing\Tests\Unit\Fixture;
-
-use Patchlevel\EventSourcing\Attribute\Event;
-
-#[Event('item_added')]
-final class ItemAdded
-{
-    public function __construct(
-        public string $productId,
-        public int $quantity,
-    ) {
-    }
-}
diff --git a/tests/Unit/Fixture/NotNormalizedProfileCreated.php b/tests/Unit/Fixture/NotNormalizedProfileCreated.php
deleted file mode 100644
index 28b66d437..000000000
--- a/tests/Unit/Fixture/NotNormalizedProfileCreated.php
+++ /dev/null
@@ -1,17 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Patchlevel\EventSourcing\Tests\Unit\Fixture;
-
-use Patchlevel\EventSourcing\Attribute\Event;
-
-#[Event('not_normalized_profile_created')]
-final class NotNormalizedProfileCreated
-{
-    public function __construct(
-        public ProfileId $profileId,
-        public Email $email,
-    ) {
-    }
-}
diff --git a/tests/Unit/Fixture/Order.php b/tests/Unit/Fixture/Order.php
deleted file mode 100644
index 9902f4b3a..000000000
--- a/tests/Unit/Fixture/Order.php
+++ /dev/null
@@ -1,75 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Patchlevel\EventSourcing\Tests\Unit\Fixture;
-
-use Patchlevel\EventSourcing\Aggregate\BasicAggregateRoot;
-use Patchlevel\EventSourcing\Attribute\Aggregate;
-use Patchlevel\EventSourcing\Attribute\Apply;
-use Patchlevel\EventSourcing\Attribute\ChildAggregate;
-use Patchlevel\EventSourcing\Attribute\Id;
-use RuntimeException;
-
-#[Aggregate('order')]
-final class Order extends BasicAggregateRoot
-{
-    #[Id]
-    private OrderId $id;
-
-    #[ChildAggregate]
-    protected OrderItems $orderItems;
-
-    #[ChildAggregate]
-    protected Payment $payment;
-
-    public function id(): OrderId
-    {
-        return $this->id;
-    }
-
-    public static function create(OrderId $id): self
-    {
-        $self = new self();
-        $self->recordThat(new OrderCreated($id));
-
-        return $self;
-    }
-
-    public function confirmPayment(): void
-    {
-        $this->payment->confirmPayment();
-    }
-
-    public function addItem(string $productId, int $quantity): void
-    {
-        if ($this->isPayed()) {
-            throw new RuntimeException('No adding possible, already paid!');
-        }
-
-        $this->orderItems->addItem($productId, $quantity);
-    }
-
-    public function isPayed(): bool
-    {
-        return $this->payment->isPayed();
-    }
-
-    public function countItem(string $productId): int
-    {
-        return $this->orderItems->countItem($productId);
-    }
-
-    public function countAll(): int
-    {
-        return $this->orderItems->countAll();
-    }
-
-    #[Apply(OrderCreated::class)]
-    protected function applyOrderCreated(OrderCreated $event): void
-    {
-        $this->id = $event->orderId;
-        $this->orderItems = new OrderItems();
-        $this->payment = new Payment();
-    }
-}
diff --git a/tests/Unit/Fixture/OrderCreated.php b/tests/Unit/Fixture/OrderCreated.php
deleted file mode 100644
index b94cfc7ab..000000000
--- a/tests/Unit/Fixture/OrderCreated.php
+++ /dev/null
@@ -1,18 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Patchlevel\EventSourcing\Tests\Unit\Fixture;
-
-use Patchlevel\EventSourcing\Attribute\Event;
-use Patchlevel\EventSourcing\Serializer\Normalizer\IdNormalizer;
-
-#[Event('order_created')]
-final class OrderCreated
-{
-    public function __construct(
-        #[IdNormalizer]
-        public OrderId $orderId,
-    ) {
-    }
-}
diff --git a/tests/Unit/Fixture/OrderId.php b/tests/Unit/Fixture/OrderId.php
deleted file mode 100644
index 2b5a8abdc..000000000
--- a/tests/Unit/Fixture/OrderId.php
+++ /dev/null
@@ -1,25 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Patchlevel\EventSourcing\Tests\Unit\Fixture;
-
-use Patchlevel\EventSourcing\Aggregate\AggregateRootId;
-
-final class OrderId implements AggregateRootId
-{
-    private function __construct(
-        private string $id,
-    ) {
-    }
-
-    public static function fromString(string $id): self
-    {
-        return new self($id);
-    }
-
-    public function toString(): string
-    {
-        return $this->id;
-    }
-}
diff --git a/tests/Unit/Fixture/OrderItems.php b/tests/Unit/Fixture/OrderItems.php
deleted file mode 100644
index 2f6948e7b..000000000
--- a/tests/Unit/Fixture/OrderItems.php
+++ /dev/null
@@ -1,41 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Patchlevel\EventSourcing\Tests\Unit\Fixture;
-
-use Patchlevel\EventSourcing\Aggregate\BasicChildAggregate;
-use Patchlevel\EventSourcing\Attribute\Apply;
-
-final class OrderItems extends BasicChildAggregate
-{
-    /** @var array<string, int> */
-    private array $items = [];
-
-    public function addItem(string $productId, int $quantity): void
-    {
-        $this->recordThat(new ItemAdded($productId, $quantity));
-    }
-
-    #[Apply]
-    public function applyItemAdded(ItemAdded $event): void
-    {
-        $this->items[$event->productId] = $event->quantity;
-    }
-
-    public function countItem(string $productId): int
-    {
-        return $this->items[$productId] ?? 0;
-    }
-
-    public function countAll(): int
-    {
-        $count = 0;
-
-        foreach ($this->items as $quantity) {
-            $count += $quantity;
-        }
-
-        return $count;
-    }
-}
diff --git a/tests/Unit/Fixture/Payment.php b/tests/Unit/Fixture/Payment.php
deleted file mode 100644
index ce987868e..000000000
--- a/tests/Unit/Fixture/Payment.php
+++ /dev/null
@@ -1,29 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Patchlevel\EventSourcing\Tests\Unit\Fixture;
-
-use Patchlevel\EventSourcing\Aggregate\BasicChildAggregate;
-use Patchlevel\EventSourcing\Attribute\Apply;
-
-final class Payment extends BasicChildAggregate
-{
-    private bool $payed = false;
-
-    public function confirmPayment(): void
-    {
-        $this->recordThat(new PaymentConfirmed());
-    }
-
-    #[Apply(PaymentConfirmed::class)]
-    public function applyItemAdded(PaymentConfirmed $event): void
-    {
-        $this->payed = true;
-    }
-
-    public function isPayed(): bool
-    {
-        return $this->payed;
-    }
-}
diff --git a/tests/Unit/Fixture/PaymentConfirmed.php b/tests/Unit/Fixture/PaymentConfirmed.php
deleted file mode 100644
index 020188d9d..000000000
--- a/tests/Unit/Fixture/PaymentConfirmed.php
+++ /dev/null
@@ -1,15 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Patchlevel\EventSourcing\Tests\Unit\Fixture;
-
-use Patchlevel\EventSourcing\Attribute\Event;
-
-#[Event('payment_confirmed')]
-final class PaymentConfirmed
-{
-    public function __construct()
-    {
-    }
-}
diff --git a/tests/Unit/Fixture/SimpleEvent.php b/tests/Unit/Fixture/SimpleEvent.php
deleted file mode 100644
index 428d3416f..000000000
--- a/tests/Unit/Fixture/SimpleEvent.php
+++ /dev/null
@@ -1,13 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Patchlevel\EventSourcing\Tests\Unit\Fixture;
-
-use Patchlevel\EventSourcing\Attribute\Event;
-
-#[Event('simple')]
-final class SimpleEvent
-{
-    public string|null $name = null;
-}
diff --git a/tests/Unit/Fixture/WrongNormalizerBasicAggregate.php b/tests/Unit/Fixture/WrongNormalizerBasicAggregate.php
deleted file mode 100644
index b4b982c25..000000000
--- a/tests/Unit/Fixture/WrongNormalizerBasicAggregate.php
+++ /dev/null
@@ -1,19 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Patchlevel\EventSourcing\Tests\Unit\Fixture;
-
-use Patchlevel\EventSourcing\Aggregate\BasicAggregateRoot;
-use Patchlevel\EventSourcing\Attribute\Aggregate;
-use Patchlevel\EventSourcing\Attribute\Id;
-
-#[Aggregate('wrong_normalizer')]
-final class WrongNormalizerBasicAggregate extends BasicAggregateRoot
-{
-    #[Id]
-    private ProfileId $id;
-
-    #[EmailNormalizer]
-    public bool $email = true;
-}
diff --git a/tests/Unit/Fixture/WrongNormalizerEvent.php b/tests/Unit/Fixture/WrongNormalizerEvent.php
deleted file mode 100644
index 88cdbda92..000000000
--- a/tests/Unit/Fixture/WrongNormalizerEvent.php
+++ /dev/null
@@ -1,17 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Patchlevel\EventSourcing\Tests\Unit\Fixture;
-
-use Patchlevel\EventSourcing\Attribute\Event;
-
-#[Event('wrong_normalizer')]
-final class WrongNormalizerEvent
-{
-    public function __construct(
-        #[EmailNormalizer]
-        public bool $email,
-    ) {
-    }
-}