 What is known of the Cathars largely comes in what is preserved by the critics in the Catholic Church which later destroyed them in the Albigensian Crusade.Alain de Lille, c.1195, accused the Cathars of believing in two gods - one of light, one of darkness.Durand de Huesca, responding to a Cathar tract c.1220 indicates that they regarded the physical world as the creation of Satan.