Geslin was the son of Henri I d'Avaugour and Mathilde de Vendôme. The date and place of his birth have not been found.
He died about 1231. The place is not known.
His wife was NN de Tonquedec. They were married, but the date and place have not been found. They had no known children.
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Geslin de Penthièvre |
Henri I d'Avaugour |
Étienne I de Penthièvre |
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Havoise de Guingamp |
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Mathilde de Vendôme |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Death | ABT 1231 |
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