Geoffroi was the son of Raoul V de Montfort and Michelle de Rostrenen. The date and place of his birth have not been found.
He died in 1329. The place is not known.
His wife was Jeanne le Boeuf de Nozay. They were married, but the date and place have not been found. Their two known children were Raoul VII (?-1347) and Mathilde (?-?).
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Geoffroi III de Montfort |
Raoul V de Montfort |
Eudon de Montfort |
Raoul IV de Montfort-le-Hédé |
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Domette de Sillé-le-Guillaume |
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Pétronille Paynel |
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Pierre IV de Rostrenen |
Pierre III de Rostrenen |
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Jeanne de Parthenay-l'Archevêque |
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Nicole de Vitré |
André III de Vitré |
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Thomasse de la Guerche |
| Event | Date | Details | Source | Multimedia | Notes |
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| Death | 1329 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | FROM 1314 TO 1329 | seigneur de Montfort et de Gaël |
| Aliases |
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| Geoffroi II de Rosières (seigneur de Lignéville, Tantonville, Vitel, Dom-Julien, Girovilliers, et de Montfort) |