- Catholic Encyclopedia - Bl. Pierre de Castelnau, Cistercian, worked for the conversion of the Albigensians, was martyred in 1208.
www.newadvent.org/cathen/12079d.htm
- For All the Saints - Brief biography of Bl. Peter of Castelnau.
users.erols.com/saintpat/ss/0115.htm#pete
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