Thomasse was born about 1295, the daughter of Geoffroy VII de Châteaubriant and Isabeau de Machecoul. The place is not known.
Her husband was Roland III de Dinan-Montafilant, who she married in 1315. The place has not been found. They had no known children.
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Thomasse de Châteaubriant |
Geoffroy VII de Châteaubriant |
Geoffroy VI de Châteaubriant |
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Isabeau de Machecoul |
Olivier I de Machecoul |
Pierre I de Dreux |
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Marguerite de Montaigu |
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Eustachie de Vitré |
André III de Vitré |
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Thomasse de la Guerche |
| Event | Date | Details | Source | Multimedia | Notes |
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| Birth | ABT 1295 |
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