The Aude has about fifteen bastides which were built after the Treaty of Meaux in 1229 when the region was attached to the Capetian crown of France. The bastide is a type of town based on a grid created in one building project on a greenfield site. The purpose of such construction was to weaken the local lords and attract people to new economic centres. These bastides came into competition with fortified villages based on ecclesiastical or seigneurial power. Chalabre, Camps-sur-l'Agly and the Bastide Saint-Louis in Carcassonne are examples of bastides in the Aude.