Guillaume was the son of Olivier de Lanvaux and Adelice d'Hennebont. The date and place of his birth have not been found.
He died after 1204. The place is not known.
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Guillaume de Lanvaux |
Olivier de Lanvaux |
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Adelice d'Hennebont |
Henri d'Hennebont |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Death | AFT 1204 |
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