Guillaume was born about 1190, the son of Guillaume II de Breteuil and Constance de Courtenay-Châteaufort. The place is not known.
He died in 1216. The place is not known.
His wife was Margaret de Briwere, who he married in ABT 1198. The place has not been found. They had no known children.
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Guillaume de Breteuil |
Guillaume II de Breteuil |
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Constance de Courtenay-Châteaufort |
Pierre I Capet |
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Élisabeth de Courtenay |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Birth | ABT 1190 |
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| Death | 1216 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | seigneur de la Ferté-Arnaud |