Bertrand was the son of Briant de Châteaubriant and Marie de Beaumanoir. The date and place of his birth have not been found.
He died after 1398. The place is not known.
His wife was Tiphaine du Guesclin. They were married, but the date and place have not been found. Their three known children were Philippe (?-?), Briant (?-<1470) and Jeanne (?-?).
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Bertrand de Châteaubriant |
Briant de Châteaubriant |
Guy de Châteaubriant |
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Marie de Beaumanoir |
Jean III (II) de Beaumanoir |
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Marie de Dinan |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Death | AFT 1398 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | seigneur de Beaufort |