diff --git a/src/Doctrine/TranslatableClassMetadata.php b/src/Doctrine/TranslatableClassMetadata.php
index 3e6b77c..6ec22db 100644
--- a/src/Doctrine/TranslatableClassMetadata.php
+++ b/src/Doctrine/TranslatableClassMetadata.php
@@ -207,7 +207,7 @@ private function findTranslatedProperties(ClassMetadata $cm, ClassMetadataFactor
         }
 
         /* Class-level #[TranslatedProperty] attributes */
-        foreach ($reflectionClass->getAttributes(Attribute\TranslatedProperty::class) as $classAttribute) {
+        foreach (self::getAttributesIncludingParents($reflectionClass, Attribute\TranslatedProperty::class) as $classAttribute) {
             $attribute = $classAttribute->newInstance();
             $propertyName = $attribute->getPropertyName();
 
@@ -219,7 +219,7 @@ private function findTranslatedProperties(ClassMetadata $cm, ClassMetadataFactor
                 continue;
             }
 
-            $candidates[$propertyName] = $attribute->getTranslationFieldname();
+            $candidates[$propertyName] ??= $attribute->getTranslationFieldname();
         }
 
         /* Register all collected candidates */
@@ -229,6 +229,20 @@ private function findTranslatedProperties(ClassMetadata $cm, ClassMetadataFactor
         }
     }
 
+    private static function getAttributesIncludingParents(ReflectionClass $rc, ?string $attributeName = null, int $flags = 0): array
+    {
+        $attributes = [];
+
+        do {
+            $attributes = array_merge(
+                $attributes,
+                $rc->getAttributes($attributeName, $flags)
+            );
+        } while ($rc = $rc->getParentClass());
+
+        return $attributes;
+    }
+
     private function findTranslationsCollection(ClassMetadata $cm, ClassMetadataFactory $classMetadataFactory): void
     {
         foreach ($cm->associationMappings as $fieldName => $mapping) {
@@ -256,14 +270,10 @@ private function findTranslationsCollection(ClassMetadata $cm, ClassMetadataFact
 
     private function findPrimaryLocale(ClassMetadata $cm): void
     {
-        foreach (array_merge([$cm->name], $cm->parentClasses) as $class) {
-            $reflectionClass = new ReflectionClass($class);
-
-            foreach ($reflectionClass->getAttributes(Attribute\Locale::class) as $attribute) {
-                $this->primaryLocale = $attribute->newInstance()->getPrimary();
+        $attributes = self::getAttributesIncludingParents($cm->getReflectionClass(), Attribute\Locale::class);
 
-                return;
-            }
+        if ($attributes) {
+            $this->primaryLocale = $attributes[0]->newInstance()->getPrimary();
         }
     }
 
diff --git a/tests/Doctrine/TranslatableClassMetadataTest.php b/tests/Doctrine/TranslatableClassMetadataTest.php
index 0b010cf..a21d9c2 100644
--- a/tests/Doctrine/TranslatableClassMetadataTest.php
+++ b/tests/Doctrine/TranslatableClassMetadataTest.php
@@ -4,6 +4,7 @@
 
 use Doctrine\Persistence\Mapping\RuntimeReflectionService;
 use Webfactory\Bundle\PolyglotBundle\Doctrine\TranslatableClassMetadata;
+use Webfactory\Bundle\PolyglotBundle\Tests\Fixtures\Entity\EntityInheritance\EntityInheritance_MappedSuperclassChainEntityLocaleOverride;
 use Webfactory\Bundle\PolyglotBundle\Tests\Fixtures\Entity\TestEntity;
 use Webfactory\Bundle\PolyglotBundle\Tests\Functional\DatabaseFunctionalTestCase;
 
@@ -22,6 +23,21 @@ public function can_be_serialized_and_retrieved(): void
         self::assertEquals($metadata, $unserialized);
     }
 
+    /**
+     * @test
+     */
+    public function subclass_locale_takes_priority_over_parent_locale(): void
+    {
+        $metadata = TranslatableClassMetadata::parseFromClass(
+            EntityInheritance_MappedSuperclassChainEntityLocaleOverride::class,
+            $this->entityManager->getMetadataFactory()
+        );
+
+        // EntityInheritance_MappedSuperclassChain (parent) declares en_GB,
+        // EntityInheritance_MappedSuperclassChainEntityLocaleOverride (child) declares de_DE.
+        self::assertSame('de_DE', $metadata->sleep()->primaryLocale);
+    }
+
     private function createMetadata(): TranslatableClassMetadata
     {
         $entityManager = $this->entityManager;
diff --git a/tests/Fixtures/Entity/EntityInheritance/EntityInheritance_MappedSuperclassChain.php b/tests/Fixtures/Entity/EntityInheritance/EntityInheritance_MappedSuperclassChain.php
new file mode 100644
index 0000000..8529180
--- /dev/null
+++ b/tests/Fixtures/Entity/EntityInheritance/EntityInheritance_MappedSuperclassChain.php
@@ -0,0 +1,35 @@
+<?php
+
+namespace Webfactory\Bundle\PolyglotBundle\Tests\Fixtures\Entity\EntityInheritance;
+
+use Doctrine\Common\Collections\ArrayCollection;
+use Doctrine\Common\Collections\Collection;
+use Doctrine\ORM\Mapping as ORM;
+use Webfactory\Bundle\PolyglotBundle\Attribute as Polyglot;
+use Webfactory\Bundle\PolyglotBundle\TranslatableInterface;
+
+/**
+ * An intermediate mapped superclass that extends the base mapped superclass and carries
+ * the full Polyglot configuration: the #[TranslatedProperty] declaration for the inherited
+ * property, and the translations collection. The concrete entity class further down the
+ * chain needs no Polyglot configuration at all (beyond #[Locale] on the entity itself).
+ */
+#[ORM\MappedSuperclass]
+#[Polyglot\Locale(primary: 'en_GB')]
+#[Polyglot\TranslatedProperty('text')]
+abstract class EntityInheritance_MappedSuperclassChain extends EntityInheritance_MappedSuperclass
+{
+    #[Polyglot\TranslationCollection]
+    #[ORM\OneToMany(targetEntity: EntityInheritance_MappedSuperclassChainEntityTranslation::class, mappedBy: 'entity')]
+    private Collection $translations;
+
+    public function __construct()
+    {
+        $this->translations = new ArrayCollection();
+    }
+
+    public function setText(TranslatableInterface $text): void
+    {
+        $this->text = $text;
+    }
+}
diff --git a/tests/Fixtures/Entity/EntityInheritance/EntityInheritance_MappedSuperclassChainEntity.php b/tests/Fixtures/Entity/EntityInheritance/EntityInheritance_MappedSuperclassChainEntity.php
new file mode 100644
index 0000000..7bc6e53
--- /dev/null
+++ b/tests/Fixtures/Entity/EntityInheritance/EntityInheritance_MappedSuperclassChainEntity.php
@@ -0,0 +1,16 @@
+<?php
+
+namespace Webfactory\Bundle\PolyglotBundle\Tests\Fixtures\Entity\EntityInheritance;
+
+use Doctrine\ORM\Mapping as ORM;
+
+/**
+ * A concrete entity two levels below the property declaration:
+ *   EntityInheritance_MappedSuperclass (property defined here, no Polyglot config)
+ *     └─ EntityInheritance_MappedSuperclassChain (#[Locale], #[TranslatedProperty], translations collection here)
+ *          └─ EntityInheritance_MappedSuperclassChainEntity (bare entity, no Polyglot config needed)
+ */
+#[ORM\Entity]
+class EntityInheritance_MappedSuperclassChainEntity extends EntityInheritance_MappedSuperclassChain
+{
+}
diff --git a/tests/Fixtures/Entity/EntityInheritance/EntityInheritance_MappedSuperclassChainEntityLocaleOverride.php b/tests/Fixtures/Entity/EntityInheritance/EntityInheritance_MappedSuperclassChainEntityLocaleOverride.php
new file mode 100644
index 0000000..8371da8
--- /dev/null
+++ b/tests/Fixtures/Entity/EntityInheritance/EntityInheritance_MappedSuperclassChainEntityLocaleOverride.php
@@ -0,0 +1,17 @@
+<?php
+
+namespace Webfactory\Bundle\PolyglotBundle\Tests\Fixtures\Entity\EntityInheritance;
+
+use Doctrine\ORM\Mapping as ORM;
+use Webfactory\Bundle\PolyglotBundle\Attribute as Polyglot;
+
+/**
+ * A second concrete entity extending the chain, overriding the locale from the
+ * intermediate mapped superclass with a different primary locale.
+ * Used to verify that a subclass's #[Locale] takes priority over a parent class's.
+ */
+#[Polyglot\Locale(primary: 'de_DE')]
+#[ORM\Entity]
+class EntityInheritance_MappedSuperclassChainEntityLocaleOverride extends EntityInheritance_MappedSuperclassChain
+{
+}
diff --git a/tests/Fixtures/Entity/EntityInheritance/EntityInheritance_MappedSuperclassChainEntityTranslation.php b/tests/Fixtures/Entity/EntityInheritance/EntityInheritance_MappedSuperclassChainEntityTranslation.php
new file mode 100644
index 0000000..1a8c411
--- /dev/null
+++ b/tests/Fixtures/Entity/EntityInheritance/EntityInheritance_MappedSuperclassChainEntityTranslation.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace Webfactory\Bundle\PolyglotBundle\Tests\Fixtures\Entity\EntityInheritance;
+
+use Doctrine\ORM\Mapping as ORM;
+use Webfactory\Bundle\PolyglotBundle\Attribute as Polyglot;
+
+#[ORM\Entity]
+class EntityInheritance_MappedSuperclassChainEntityTranslation
+{
+    #[ORM\Id]
+    #[ORM\GeneratedValue]
+    #[ORM\Column(type: 'integer')]
+    private ?int $id = null;
+
+    #[Polyglot\Locale]
+    #[ORM\Column]
+    private string $locale;
+
+    #[ORM\ManyToOne(inversedBy: 'translations')]
+    private EntityInheritance_MappedSuperclassChainEntity $entity;
+
+    #[ORM\Column]
+    private string $text;
+}
diff --git a/tests/Functional/MappedSuperclassChainInheritanceTest.php b/tests/Functional/MappedSuperclassChainInheritanceTest.php
new file mode 100644
index 0000000..9fc6c8c
--- /dev/null
+++ b/tests/Functional/MappedSuperclassChainInheritanceTest.php
@@ -0,0 +1,89 @@
+<?php
+
+namespace Webfactory\Bundle\PolyglotBundle\Tests\Functional;
+
+use Webfactory\Bundle\PolyglotBundle\Tests\Fixtures\Entity\EntityInheritance\EntityInheritance_MappedSuperclass;
+use Webfactory\Bundle\PolyglotBundle\Tests\Fixtures\Entity\EntityInheritance\EntityInheritance_MappedSuperclassChain;
+use Webfactory\Bundle\PolyglotBundle\Tests\Fixtures\Entity\EntityInheritance\EntityInheritance_MappedSuperclassChainEntity;
+use Webfactory\Bundle\PolyglotBundle\Tests\Fixtures\Entity\EntityInheritance\EntityInheritance_MappedSuperclassChainEntityTranslation;
+use Webfactory\Bundle\PolyglotBundle\Translatable;
+
+/**
+ * Tests the two-level mapped superclass chain:
+ *   EntityInheritance_MappedSuperclass          — property defined here, no Polyglot config
+ *     └─ EntityInheritance_MappedSuperclassChain — #[Locale], #[TranslatedProperty], translations collection here
+ *          └─ EntityInheritance_MappedSuperclassChainEntity — bare entity, no Polyglot config needed
+ *
+ * The concrete entity must pick up the #[TranslatedProperty] and #[Locale] declarations
+ * from the intermediate mapped superclass two levels up.
+ */
+class MappedSuperclassChainInheritanceTest extends DatabaseFunctionalTestCase
+{
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        self::setupSchema([
+            EntityInheritance_MappedSuperclass::class,
+            EntityInheritance_MappedSuperclassChain::class,
+            EntityInheritance_MappedSuperclassChainEntity::class,
+            EntityInheritance_MappedSuperclassChainEntityTranslation::class,
+        ]);
+    }
+
+    public function testPersistAndReloadEntity(): void
+    {
+        $entity = new EntityInheritance_MappedSuperclassChainEntity();
+        $t = new Translatable('base text');
+        $t->setTranslation('Basistext', 'de_DE');
+        $entity->setText($t);
+
+        self::import([$entity]);
+
+        $loaded = $this->entityManager->find(EntityInheritance_MappedSuperclassChainEntity::class, $entity->getId());
+
+        self::assertSame('base text', $loaded->getText()->translate('en_GB'));
+        self::assertSame('Basistext', $loaded->getText()->translate('de_DE'));
+    }
+
+    public function testAddTranslation(): void
+    {
+        $entityManager = $this->entityManager;
+
+        $entity = new EntityInheritance_MappedSuperclassChainEntity();
+        $entity->setText(new Translatable('base text'));
+        self::import([$entity]);
+
+        $loaded = $entityManager->find(EntityInheritance_MappedSuperclassChainEntity::class, $entity->getId());
+        $loaded->getText()->setTranslation('Basistext', 'de_DE');
+        $entityManager->flush();
+
+        $entityManager->clear();
+        $reloaded = $entityManager->find(EntityInheritance_MappedSuperclassChainEntity::class, $entity->getId());
+
+        self::assertSame('base text', $reloaded->getText()->translate('en_GB'));
+        self::assertSame('Basistext', $reloaded->getText()->translate('de_DE'));
+    }
+
+    public function testUpdateTranslations(): void
+    {
+        $entityManager = $this->entityManager;
+
+        $entity = new EntityInheritance_MappedSuperclassChainEntity();
+        $t = new Translatable('old text');
+        $t->setTranslation('alter Text', 'de_DE');
+        $entity->setText($t);
+        self::import([$entity]);
+
+        $loaded = $entityManager->find(EntityInheritance_MappedSuperclassChainEntity::class, $entity->getId());
+        $loaded->getText()->setTranslation('new text');
+        $loaded->getText()->setTranslation('neuer Text', 'de_DE');
+        $entityManager->flush();
+
+        $entityManager->clear();
+        $reloaded = $entityManager->find(EntityInheritance_MappedSuperclassChainEntity::class, $entity->getId());
+
+        self::assertSame('new text', $reloaded->getText()->translate('en_GB'));
+        self::assertSame('neuer Text', $reloaded->getText()->translate('de_DE'));
+    }
+}