Guillaume was the son of Guy de Montmorency-Laval and Isabelle de Beaumont-Gâtinais. The date and place of his birth have not been found.
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Guy de Montmorency-Laval |
Guy VII de Montmorency-Laval |
Mathieu II de Montmorency |
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Emme de Laval |
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Philippa de Vitré |
André III de Vitré |
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Catherine de Thouars |
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Isabelle de Beaumont-Gâtinais |
Guillaume de Beaumont-Gâtinais |
Jean de Beaumont-Gâtinais |
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Alix de Villemomble |
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Jeanne d'Aquigny |
Baudouin de Tosny |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | seigneur de Pacy-sur-Marne |