- Born in 1543
- Deceased on May 26, 1580 in Cahors, at the approximate age of 36 years
Parents
- Guy de Guilhem de Castelnau (c. 1521 - 1544)
- Louise d'Avaugour (1515 - 1608), fille d'honneur de marguerite d'angoulème de navarre
Family
- Married on May 28, 1565 in Toulouse, with Aldonce de Bernuy (1545 - 1612), dame de Saissac, dame d'honneur de Catherine de Médicis, issuing
Occupations
- sénéchal de Toulouse
- gouverneur du Quercy