Guillaume was the son of Geoffroy I de Montfort-le-Hédé and Gervaise de Saie. The date and place of his birth have not been found.
He died in 1235. The place is not known.
His wife is not known. They were married, but the date and place have not been found. Their only known child was Mahaud (?-1279).
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Guillaume II de Montfort |
Geoffroy I de Montfort-le-Hédé |
Guillaume I de Montfort-le-Hédé |
Raoul de Montfort |
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Havoise de Hédé |
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Amicie de Porhoët |
Eudon II de Bretagne |
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Berthe I de Cornouaille |
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Gervaise de Saie |
Ruelland de Saie |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Death | 1235 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | FROM 1181 TO 1235 | seigneur de Montfort |