Guillaume was the son of unknown parents. The date and place of his birth have not been found.
He died in 1255. The place is not known.
He had two marriages/partners. His first wife was Isabelle de Lorraine, who he married in BEF 1255. The place has not been found. They had no known children.
His second wife was Agnes von Pfirt. They were married, but the date and place have not been found. They had no known children.
| Event | Date | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|
| Death | 1255 |
|