Château de Joyeuse Garde is the site of a castle associated with Arthurian legend. Its ruins in the town of La Forest-Landerneau in Brittany date to the sixth century AD, but the latest castle was built in the 12th century.
References:The Château du Lude is one of the many great châteaux of the Loire Valley in France. Le Lude is the most northerly château of the Loire Valley and one of the last important historic castles in France, still inhabited by the same family for the last 260 years. The château is testimony to four centuries of French architecture, as a stronghold transformed into an elegant house during the Renaissance and the 18th century. The monument is located in the valley of Le Loir. Its gardens have evolved throughout the centuries.