Guillaume was the son of Hugues I de Grandmesnil and Alix de Beaumont-sur-Oise. The date and place of his birth have not been found.
He died before 1114. The place is not known.
His wife was Mabille de Hauteville. They were married, but the date and place have not been found. They had no known children.
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Guillaume de Grandmesnil |
Hugues I de Grandmesnil |
Robert I |
Gervaise de Grandmesnil |
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Hawise d'Échauffour |
Giroie d'Échauffour |
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Gisèle de Montfort |
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Alix de Beaumont-sur-Oise |
Yves de Beaumont-sur-Oise |
Yves II de Beaumont-sur-Oise |
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Judée Lupus de Bretagne |
Geoffroy I Bérenger de Bretagne |
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Havoise de Normandie |
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| Event | Date | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|
| Death | BEF 1114 |
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