Guillaume was born about 1095, the son of Robert IV de Béthune and Adélaïde de Péronne. The place is not known.
He died in 1144. The place is not known.
His wife was Clémence de Cambrai-Oisy, who he married in 1129. The place has not been found. Their two known children were Robert V (c1130-1191) and Mathilde (c1135-?).
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Guillaume I de Béthune |
Robert IV de Béthune |
Robert III de Béthune |
Robert de Béthune |
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Adélaïde de Péronne |
Robert II de Péronne |
Robert I de Péronne |
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Adelise de Saint-Quentin |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Birth | ABT 1095 |
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| Death | 1144 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|---|
| Nobility Title | seigneur de Béthune | |||||
| Nobility Title | seigneur de Varneston | |||||
| Nobility Title | avoué d'Arras |