Guillaume was the son of Geoffroy I de Mandeville and Adélize de Balts. The date and place of his birth have not been found.
He died in BET 1105 AND 1116. The place is not known.
His wife was Marguerite. They were married, but the date and place have not been found. They had no known children.
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Guillaume I de Mandeville |
Geoffroy I de Mandeville |
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Adélize de Balts |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Death | BET 1105 AND 1116 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | gardien de la Tour de Londres |