Guillaume was the son of Joscelin I de Parthenay but his mother is unknown. The date and place of his birth have not been found.
He died in 1058. The place is not known.
His wife was Aremgarde. They were married, but the date and place have not been found. Their five known children were Simon I (1047-1075), Joscelin II (?-1086), Gelduin (?-1093), Ebbon (1110-?) and Béatrice (?-?).
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Guillaume I de Parthenay |
Joscelin I de Parthenay |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Death | 1058 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | FROM 1021 TO 1058 | seigneur de Parthenay |