Pierre de Castelnau
Pierre de Castelnau (died 15 January 1208), French ecclesiastic, was born in the diocese of Montpellier.
In 1207 he was in the Rhone valley and in Provence, where he became involved in the strife between the count of Baux and Raymond, count of Toulouse. Castelnau was assassinated on 15 January 1208, quite possibly by an agent of Raymond. His murder was the immediate cause of Raymond's excommunication and the start of the Albigensian Crusade.
- "Blessed Pierre de Castelnau". Catholic Encyclopedia. New York: Robert Appleton Company. 1913.
- Zoe Oldenbourg. The Massacre at Montsegur. A History of the Albigensian Crusade. Phoenix, 2006. p. 3,4. ISBN 1-84212-428-5.
- "http://en.wikisource.org/wiki/Catholic_Encyclopedia_(1913)/Blessed_Pierre_de_Castelnau" Catholic Encyclopedia (1913)/Bl. Pierre de Castelnau
- Graham-Leigh, Elaine. The Southern French Nobility and the Albigensian Crusade. Woodbridge: The Boydell Press, 2005. ISBN 1-84383-129-5
- De la Bouillerie, Le Bienheureux Pierre de Castelnau et les Albigeois au XIII' siècle (Paris, 1866).
- This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "Pierre de Castelnau". Encyclopædia Britannica (11th ed.). Cambridge University Press.