Bouillon Castle is the most famous landmark in the town of the same name in the province of Luxembourg, and it is a prominent and important archaeological monument, as it dates back to the medieval period, and in 1082 Godfrey of Bouillon inherited the castle, and then sold it to the bishop of Bouillon. Liege-Aubert in order to finance the First Crusade, and in the late seventeenth century the military engineer Louis XIV redesigned it for military use.