This work aims to reconstruct one of the most vividly documented fragments of medieval life concerning the late Cathar community in south-west France. Following the inquisition of the 1240s in which 10,000 Cathars were burned at the stake, it seemed this early heretical movement had been fully quashed. Fifty years later however, a revival was started, centred around the small town of Montaillou and led by the charismatic Authies brothers. It would be another 30 years before Rome finally stamped out the movement.