Guillaume was born about 1145, the son of Raoul de Mauvoisin and Brita. The place is not known.
He died about 1200. The place is not known.
His wife was Adeline le Bosc. They were married, but the date and place have not been found. Their only known child was Guy III (?-c1211).
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Guillaume II de Mauvoisin |
Raoul de Mauvoisin |
Raoul II de Mauvoisin |
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Brita |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Birth | ABT 1145 |
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| Death | ABT 1200 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | seigneur de Rosny |