It was prompted by the murder of papal legate Pierre de Castlenau shortly after the excommunication of Raymond.
Prominent historians who wrote about this event include Peter of les Vaux-de-Cernay. Raymond-Roger de Trencevel was heavily involved in its early stage; that period saw the city of Bezier completely obliterated and the residents of Carcassone forced to strip naked before leaving the city. During this event, a commander died when ammunition from a mangonel allegedly manned by women crushed his head at the siege of Toulouse. In addition to the death of the elder Simon de Montfort, this event led to the marriage of Louis IX's son when Blanche of Castile signed a treaty that gave Raymond of Toulouse control of much of southern France in exchange for fighting in this conflict. It was prompted by the murder of papal legate Pierre de Castlenau shortly after the excommunication of Raymond. Innocent III promised the land of the target group to anyone willing to fight. For 10 points, name this attempt to eradicate a heretical Christian sect based in Languedoc.
Prominent historians who wrote about this event include Peter of les Vaux-de-Cernay.
Albigensian Crusade [or Cathar Crusade]