The Perfect Heresy chronicles the life and death of the Cathar movement, one of western civilization’s most mind-boggling tales. At the beginning of the thirteenth century, the Cathars, a group of heretical Christians, thrived across what is now southern France. Supported by the leading nobility of the region, the Cathars held revolutionary beliefs that threatened the authority of the Catholic Church. The powerful new Pope, Innocent III, resolved to eradicate the Cathars and did so via the forces of France in a series of crusades between 1209 and 1244, thereby redrawing the map of Europe and unleashing the Inquisition. Full of colorful and passionate personalities, The Perfect Heresy sheds new light on the thirteenth century and on the timelessness of religious intolerance.