In Languedoc, the only real "Cathar castles" were fortified homesteads (castrum), such as Laurac, Fanjeaux, Mas-Saintes-Puelles. Certain sites like Lastours-Cabaret, Montségur, Termes or Puilaurens were castra before being razed to the ground and becoming royal citadels. The legend of Cathar architects and builders is no more than a myth. The only monuments which witnessed the events of the first half of the 13th century, and therefore the only ones which can claim the description "Cathar", given that the Cathar Church never built anything, are the small castles, often totally unknown to the public, whose meagre ruins are away from the tourist routes.
Following the failure of the attempt to recapture Carcassonne by Raimond II, Viscount Trencaval in 1240, the Cité de Carcassonne was considerably reinforced by the French king, new master of the territory. He flattened small castra in the Corbières region and built citadels to protect the frontier with the kingdom of Aragon.
These five castles are often called the cinq fils de Carcassonne (five sons of Carcassonne):
These five fortresses resisted various assaults led by the Aragonese army.