""The Popes and Heresy in the Thirteenth Century"" is a historical book written by Albert Clement Shannon. It provides a comprehensive analysis of the role of the Popes in combating heresy during the 13th century. The book focuses on the period between 1200 and 1300, which was marked by numerous heretical movements such as Catharism, Waldensianism, and the Albigensian Crusade.The author examines the theological and political factors that led to the...