Hervé was born about 1165, the son of Guyomarch IV (VI) de Léon and Nobilis de Penthièvre-Tréguier. The place is not known.
He died about 1208. The place is not known.
His wife was Marguerite de Rohan, who he married in ABT 1180. The place has not been found. Their four known children were Elonore (c1184-?), Hervé II (1183-1218), Constance (c1182->1208) and Salomon (?-?).
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Hervé I de Léon |
Guyomarch IV (VI) de Léon |
Hervé II de Léon |
Guyomarch III de Léon |
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Marie de Blois |
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Nobilis de Penthièvre-Tréguier |
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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| Birth | ABT 1165 |
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| Death | ABT 1208 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | seigneur de Crozon | |||||
| Nobility Title | vicomte de Léon |