Guillaume was the son of unknown parents. The date and place of his birth have not been found.
His wife was Bradimène de Foix, who he married in 1131. The place has not been found. They had no known children.
| Attribute | Date | Description | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|---|
| Nobility Title | vicomte de Sault | |||||
| Nobility Title | baron de Niort |