The 15th century Château des Ducs was a massive castle in Alençon. The first castle, built in the 11th century, is completely disappeared today. The next castle was built by Peter II, the count of Alençon between 1361-1404. It was demolished 1592. Today only a impressive gatehouse and part of the walls remain.
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.