In about 1204, Raymond de Péreille, one of the two lords of Montségur, the other being his cousin Pierre-Roger de Mirepoix, decided to rebuild the castle that had been in ruins for 40 years or more. Refortified, the castle became a center of Cathar activities, and home to Guilhabert de Castres, a Cathar theologian and bishop. In 1233 the site became "the seat and head" ("domicilium et caput") of the Cathar church. It has been estimated that the fortified site housed about 500 people when in 1241, Raymond VII besieged Montsegur without success. The murder of representatives of the inquisition by about fifty men from Montsegur and faidits at Avignonet on May 28, 1242 was the trigger for the final military expedition to conquer the castle, the siege of Montségur.