With the military phase of the campaign against the Cathars now primarily at an end, the Inquisition was established under Pope Gregory IX in 1234 to uproot heretical movements, including the remaining Cathars. O… See more

According to Edward Peters, the violence of the Albigensian Crusade was not in line with the reforms and plans of Innocent, who stressed confession, reform of the clergy and laity, and pastoral teachings to oppose heresy. Pet… See more

• Aubrey, Elizabeth (1997). "The Dialectic between Occitania and France in the Thirteenth Century". Early Music History. 16: 1–53. doi:10.1017/S0261127900001686. JSTOR 853799. S2CID 193213329.
• Aubrey, Elizabeth (… See more

• Lippiatt, G.E.M. (2017). Simon V of Montfort and Baronial Government, 1195–1218. Oxford: Oxford University Press. ISBN 978-0-19-880513-7.
• Mann, Judith (2002). The Trail of Gnosis: A Lucid Exploratio… See more