Guillaume was born after 1214, the son of Jean de Beaumont-Gâtinais and Alix de Villemomble. The place is not known.
He died in 1269. The place is not known.
He had two marriages/partners. His first wife was Jeanne d'Aquigny. They were married, but the date and place have not been found. Their four known children were Marguerite (?->1295), Agnès (c1230->1260), Isabelle (c1240-1277) and Guillaume (c1240-1268).
His second wife was Isabelle de Montmorency, who he married in AFT 1265. The place has not been found. They had no known children.
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Guillaume de Beaumont-Gâtinais |
Jean de Beaumont-Gâtinais |
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Alix de Villemomble |
Robert de Mauvoisin |
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Cécile de Chevreuse |
Milon IV de Chevreuse |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Birth | AFT 1214 |
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| Death | 1269 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | conte di Caserta | |||||
| Nobility Title | seigneur de Beaumont-du-Gâtinais et de Villemonble |
Note 1