Guillaume was born about 1225, the son of unknown parents. The place is not known.
He died in 1296 in Bayonne, Gascogne.
His wife was Joan de Munchensy. They were married, but the date and place have not been found. They had no known children.
| Event | Date | Details | Source | Multimedia | Notes | ||
|---|---|---|---|---|---|---|---|
| Birth | ABT 1225 |
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| Death | 1296 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|---|
| Nobility Title | seigneur de Valence, de Montignac, de Bellac, de Rançon et de Champagnac | |||||
| Nobility Title | lord of Wexford (Ireland) | |||||
| Nobility Title | FROM 1247 TO 1296 | earl of Pembroke |
| Association | Relationship |
|---|---|
| sir Stephen de Valence (liuetenant of Dover Castle & Cinque Ports) | descendant |