The bull was issued in the wake of the murder of the papal inquisitor of Lombardy, St. Peter of Verona, who was killed by a conspiracy of Cathar sympathizers on 6 April 1252.
In 1967, he created the Cathar group, including actors such as Mercedes Sampietro and Jeannine Mestre.
Kathleen McGowan's novel "The Expected One" incorporates the story of the Siege of Montsegur in the telling of Cathar history.
Their castle stood in the Thuringian Forest on the Border of Hesse and they had embraced Albigensian (i.e., Cathar) doctrines, combining Gnostic and Christian beliefs.
His next work, Toloza, an epic poem about the invasion of the Albigenses by Simon de Montfort, came in 1882, to further acclaim.
Born in Castres, he became a Perfect (Parfaits) and, between 1223 and 1226, Bishop of Toulouse in the Cathar Church.
He was a close friend to inquisitor Pietro da Verona and actively collaborated with the Inquisition in prosecuting heretics, especially the believers of the Church of Concorezzo, a very active Cathar group of that was supported by the bishop of Concorezzo (a town North-East of Milan, near Monza) and by local feudatory Filippo Confalonieri.
members of the Bosnian Church, a branch of the Bogomils that existed in Bosnia during the Middle Ages and was considered to be a part of the Cathar movement by Italian writers against heresy
In 1167 the Cathars held a Council here, attended by many local figures and also by the Bogomil papa Nicetas, the Cathar bishop of (northern) France and a leader of the Cathars of Lombardy.