Château de Bonaguil is a castle in the French commune of Saint-Front-sur-Lémance, but actually owned by the neighbouring commune of Fumel in the Lot-et-Garonne département. It has been classified as a Monument historique (historic monument) since 1862. The Château de Bonaguil was the last of the fortified castles. It was built in the 13th century, but was entirely restructured at the end of the 15th and beginning of the 16th centuries by Bérenger de Roquefeuil, who added all of the defensive improvements of the end of the Middle Ages. A marvel of military architecture covering 7500 m2, incorporating the latest developments in artillery (both for defence and in adapting the defences for protection against it) it was, however, obsolete when completed. It was never attacked. The name derives from bonne aiguille (good needle) and refers to the defensive site: a steep, rocky promontory perfectly suited to the siting of a castle. The first castle at Bonaguil was constructed after the middle of the 13th century (between 1259 and 1271 according to Jacques Gardelle), on a rocky spur, probably by Arnaud La Tour de Fumel. The single entrance to the keep, built above a natural cave, was a door six metres up, accessible by ladder. The first written mention is in 1271, in a charter listing the possessions of the King of France Philippe III le Hardi. At that date, it was a vassal of the fiefdom of Tournon, and was probably just a simple polygonal keep, with a small courtyard surrounded by a wall, with a lower courtyard surrounded by a palisade. The dwelling was not built until the end of the 13th century or even the beginning of the 14th. The widening of a fracture in the rock allowed a well to be dug to a depth of 47 m (154 ft). The lords of Bonaguil fought on the side of the King of England in the Hundred Years War. The castle was taken several times, burnt and abandoned, although always the property of the Fumel family. On 11 November 1380, Jean de Fumel-Pujols, baron of Blanquefort and owner of the castle, married the heiress of Roquefeuil, Jeanne Catherine de Roquefeuil, and dropped his name for the more prestigious name of his wife. Their son Antoine joined the properties of the two families, and their grandson, Jean de Roquefeuil, moved with his wife Isabeau de Peyre to Bonaguil in 1444.