Pierre de Castelnau
Pierre de Castelnau (? - died 15 January 1208) was a French Catholic diplomat who was made papal legate in 1199 to address the Cathar heresy before being murdered in 1208. Following his death, Pope Innocent III beatified him, excommunicated Count Raymond VI of Toulouse and declared the Albigensian Crusade.
In the Martyrology
- January 15 Blessed Pierre de Castelnau, priest and martyr