Jean was born in 1337, the son of Hugues III (IV) de Castelnau and Maralde de Canillac. The place is not known.
He died after 1395. The place is not known.
He had two marriages/partners. His first wife was Marguerite de la Vie de Villemur, who he married in 1353. The place has not been found. They had no known children.
His second wife was Catherine de Penne, who he married in 1392. The place has not been found. They had no known children.
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Jean I de Castelnau |
Hugues III (IV) de Castelnau |
Maffre III de Castelnau |
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Alasie de Calmont d'Olt |
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Maralde de Canillac |
Marques de Canillac |
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Guillaume de Poitiers-Valentinois |
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Luce de Beaudiner |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Birth | 1337 |
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| Death | AFT 1395 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|---|
| Nobility Title | baron de Castelnau-Bretenoux 10° | |||||
| Nobility Title | baron de Calmont-d'Olt | |||||
| Nobility Title | seigneur de Saint-Santin et de Bretenoux | |||||
| Nobility Title | gouverneur de Guyenne |