Cathar

The first mention of Catharism by chroniclers was in 1143; four years later, the Catholic Church denounced Cathar practices, particularly the consolamentum ritual. From the beginning of his reign, Pope Innocent III attempted to end Catharism by sending missionaries and persuading the local authorities to act against the Cathars. In 1208, Pierre de Castelnau, Innocent's papal legate, was murdered while returning to Rome after excommunicating Count Raymond VI of Toulouse, who, in his view, was too lenient with the Cathars. Pope Innocent III then declared de Castelnau a martyr and launched the Albigensian Crusade in 1209. The nearly twenty-year campaign succeeded in vastly weakening the movement. The Medieval Inquisition that followed ultimately eradicated Catharism.