The village of Duilhac has medieval origins (XI century) and it probably arose around the Romanesque structure of the church of St-Michel, built with a single nave and a semicircular apse. It preserves the medieval structure in the Fort, which corresponds to the area surrounded by polygonal walls of the XIV century. To the north of this area there is a monumental fountain wash-house. The castle of Peyrepertuse is one of the most significant examples of medieval military architecture. The place was probably fortified during the Late Middle Ages, but the castle is mentioned in official documents only in the XI century. It played an important strategic role in the XIII century because of its location on the border with the reign of Aragon, and it was equipped with extraordinary means of defence by King Louis IX, the Saint. The royal fortress was built with a tremendous workforce deployment, using the chalky stones coming from the ridge where it stands. The lime was also produced in loco. The castle was used as a garrison and it permanently housed a Lord during the entire XIII and XIV centuries. The decline of the castle began in the XVII century, when the border between the reigns of France and Spain was shifted to the main crest of the Pyrenees. A garrison was located there until the French Revolution, when the castle was definitively abandoned. The restoration of the ruins started in the Seventies of the XX century. The castle can be visited: tel. 33 (0)4 68 45 40 55.