Assassination of Peter of Castelnau Sparks the Albigensian Crusade
On January 31, 1208, papal legate Peter of Castelnau was murdered on the banks of the Rhône near Saint-Gilles in southern France. He had been sent by Pope Innocent III to confront Raymond VI, Count of Toulouse, over the spread of Cathar beliefs in Languedoc. According to contemporary chronicles, the killing was blamed on Raymond’s entourage, giving Innocent III the pretext to call the Albigensian Crusade against the region. The resulting campaign reshaped the political map of southern France and brutally suppressed one of medieval Europe’s most prominent dissident Christian movements.