The Château de Ranton is a small fortified castle in the village of Ranton, in the Department of the Vienne just west of Loudun, and south of the Loire. It was one of the front-line of fortresses which were built to defend the royal city of Loundun at the beginning of the Hundred Years' War in 1340-1345. It played this military role until 1372. It then became a feudal manor and one of the estates of aristocratic families associated with the Courts of the French Kings and the Dukes of Anjou.