Guillaume was the son of Guillaume de Poitiers-Valentinois and Luce de Beaudiner. The date and place of his birth have not been found.
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Guillaume de Poitiers-Valentinois |
Aymar III de Poitiers-Valentinois |
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Alix de Mercœur |
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Luce de Beaudiner |
Guillaume de Beaudiner |
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Sibylle de Solignac |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | seigneur de Saint-Vallier | |||||
| Nobility Title | sénéchal de Toulouse |