Guillaume was born about 1325, the son of Guillaume III de Vassal de Vaillac but his mother is unknown. The place is not known.
He died about 1370. The place is not known.
His wife was Catherine de Taillefer de Marsan. They were married, but the date and place have not been found. Their only known child was Aygline (?-?).
| Event | Date | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|
| Birth | ABT 1325 |
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| Death | ABT 1370 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|---|
| Nobility Title | coseigneur de Vaillac |