city was a Catharist stronghold until the Albigensian Crusade . The Cathars of Carcassonne have since featured in many fictional, occultist and pseudo-historical works (e.g. Labyrinth and Holy Blood, Holy Grail ). The city's restoration by Viollet-le-Duc and his successors has certain similarities to the relationship between the cities of Hastur/Yhtill/Alar