High Quality Content by WIKIPEDIA articles! The Albigensian Crusade or Cathar Crusade (1209–1229) was a 20-year military campaign initiated by Pope Innocent III to eliminate Catharism in Languedoc, in the south of France. The Crusade was prosecuted primarily by the French crown and promptly took on a political flavour, resulting in not only a significant reduction in the number of practicing Cathars but also a realignment of Occitania, bringing it into the sphere of the French crown and diminishing the distinct regional culture and high level of Aragonese influence. The Cathars were a medieval Christian sect with a neo-manichaean philosophy. It originated from a reform movement within the Bogomil churches of Dalmatia and Bulgaria calling for a return to the Christian message of perfection, poverty and preaching. They became known as the Albigensians as it gained many adherents in the city of Albi and surrounding area in the twelfth and thirteenth century.