Guillaume was the son of unknown parents. The date and place of his birth have not been found.
He died in 1252. The place is not known.
His wife was Isabelle de Rougemont. They were married, but the date and place have not been found. Their two known children were Jean (?-1252) and Pierre (?-1277).
| Event | Date | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|
| Death | 1252 |
|
Note 1
Son of Adam de Montferant and Elisabeth d'Oreye