Guillaume was born about 1020, the son of Osbern de Crépon and Emma de Bayeux. The place is not known.
He died on 22 FEB 1071. The place is not known.
He had three marriages/partners. His first wife was Adelize de Tosny. They were married, but the date and place have not been found. Their four known children were Roger (c1030->1087), Guillaume (?-1103), Emma (?-?) and Isabelle (?-?).
His second wife is not known. They were married, but the date and place have not been found. Their only known child was Raoul (?-?).
His third wife was Richilde de Hainaut, who he married in AFT 1070. The place has not been found. They had no known children.
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Guillaume FitzOsbern |
Osbern de Crépon |
Herfast de Crépon |
Herbast de Crépon |
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Cyrid |
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Emma de Bayeux |
Raoul de Bayeux |
Asperling de Bayeux |
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Sprota de Bretagne |
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Eremburge de Caux |
Canville de Caux |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Birth | ABT 1020 |
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| Death | 22 FEB 1071 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | seigneur de Breteuil-sur-Iton et de Cormeilles dans l'Eure | |||||
| Nobility Title | comte de Hereford |
Note 1
William of Breteuil was held captive and tortured by his daughter's unwelcome suitor, Ascelin Gouel de Perceval 'Lupus', Sire de Yvery, until he finally granted daughter Isabella de Breteuil's hand in marriage to him.