Guillaume was the son of Guillaume I (III) Raymond de Castellvell but his mother is unknown. The date and place of his birth have not been found.
He died in 1166. The place is not known.
His wife was Mafalda de Barcelona, who he married in ABT 1131. The place has not been found. Their only known child was Guillaume II (?-1178).
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Ramon I Bonfill de Castellvell |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Death | 1166 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | FROM 1126 TO 1166 | seigneur de Castellvi de Rosanes |