Isabeau was the daughter of Robert VIII de Béthune and Jeanne de Châtillon. The date and place of her birth have not been found.
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Robert VIII de Béthune |
Jean I de Béthune |
Guillaume VI de Béthune |
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Marie de Roye |
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Jeanne de Coucy |
Enguerrand de Coucy |
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Marie de Vienne |
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Jeanne de Châtillon |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | dame de Chaumont et de Porcéan |