Geoffroy was the son of Briant I de Châteaubriant but his mother is unknown. The date and place of his birth have not been found.
He died before 1066. The place is not known.
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Geoffroy I de Châteaubriant |
Briant I de Châteaubriant |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Death | BEF 1066 |
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Note 1
il prend part à la Première croisade