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Son of Hugues IV, baron de Castelnau et de Calmont d'Olt and Maralde de Canillac Husband of Marguerite de La Vie de Villemur Father of Marie Castelnau Brother of Hélène de Castelnau; Barrave de Castelnau; Adalasie de Castelnau and Marguerite de Castelnau Half brother of Gaillarde de Castelnau