Isabeau was born about 1362, the daughter of Jean III de Beaumanoir and Marguerite de Rohan. The place is not known.
She had two marriages/partners. Her first husband was Jean I de Tournemine, who she married in ABT 1382. The place has not been found. They had no known children.
Her second husband was Guillaume de la Boulaye, who she married in AFT 1409. The place has not been found. They had no known children.
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Isabeau de Beaumanoir |
Jean III de Beaumanoir |
Jean III (II) de Beaumanoir |
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Marie de Dinan |
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Marguerite de Rohan |
Alain VII de Rohan |
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Jeanne de Rostrenen |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Birth | ABT 1362 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | dame de Pont-Guingamp |