Guillaume was the son of Guillaume II (IV) Raymond de Castellvell and Mafalda de Barcelona. The date and place of his birth have not been found.
He died in 1178. The place is not known.
His wife was Balasqueta de Vilademuls. They were married, but the date and place have not been found. Their only known child was Guillemette (?-1228).
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Guillaume II de Castellvell |
Ramon I Bonfill de Castellvell |
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Mafalda de Barcelona |
Ramón III Berenguer de Barcelona |
Ramón II Berenguer de Barcelona |
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Mahaut de Hauteville |
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Douce Aldonza de Gévaudan |
Gilbert I de Millau |
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Gerberge de Provence |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Death | 1178 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | FROM 1167 TO 1178 | seigneur de Castellvi de Rosanes | ||||
| Nobility Title | FROM 1174 TO 1178 | baron de Castellvell |