Guillaume was born about 0970, the son of Richard de Bastembourg and Aubérée. The place is not known.
He died after 1010. The place is not known.
His wife was NN de Beaufou, who he married in ABT 1010. The place has not been found. Their only known child was Guillaume II (c1010-1049).
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Guillaume I Bertrand de Bricquebec |
Richard de Bastembourg |
Anslech Lancelot de Bricquebec |
Rollo Thurstan Bigod |
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Gerlotte de Blois |
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Gillette de Beaumont |
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Aubérée |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Birth | ABT 0970 |
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| Death | AFT 1010 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | sire de Bricquebec |