Guillaume was born about 1138, the son of Raoul de Coëtquen but his mother is unknown. The place is not known.
He died in 1203. The place is not known.
His wife was Denise de Dol, who he married in ABT 1158. The place has not been found. Their only known child was Olivier (c1159->1202).
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Guillaume de Coëtquen |
Raoul de Coëtquen |
Geoffroy II de Dinan |
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Radegonde de Château-Giron |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Birth | ABT 1138 |
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| Death | 1203 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | seigneur de Coëtquen |