Guiomarch was the son of Guyomarch IV (VI) de Léon and Nobilis de Penthièvre-Tréguier. The date and place of his birth have not been found.
He died about 1238. The place is not known.
His wife was Alix de Rohan. They were married, but the date and place have not been found. Their only known child was Conan (c1184-?).
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Guiomarch 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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| Death | ABT 1238 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | vicomte de Léon |