Isabelle was born about 1240, the daughter of Guillaume de Beaumont-Gâtinais and Jeanne d'Aquigny. The place is not known.
She died in 1277. The place is not known.
Her husband was Guy de Montmorency-Laval, who she married in 1260. The place has not been found. Their two known children were Guy IX (c1270-1333) and Guillaume (?-?).
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Isabelle de Beaumont-Gâtinais |
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 |
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Jeanne d'Aquigny |
Baudouin de Tosny |
Raoul IV de Tosny |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Birth | ABT 1240 |
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| Death | 1277 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | dame de Bréviaire | |||||
| Nobility Title | dame de Villemomble et de Passy-sur-Marne |
Note 1