The first fort in Belle-Île island was built in 1540 by François of Rohan. It was heavily reconstructed as a large fortress in 1683-1689 according the design of famous fortress architect Sébastien Le Prestre de Vauban. In 1761-63 it was besieged and occupied by the English fleet. Since 1960 it has been a Museum hotel.
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.