Guillaume was the son of unknown parents. The date and place of his birth have not been found.
His wife was Adelvis de Guînes. They were married, but the date and place have not been found. They had no known children.
| Attribute | Date | Description | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|---|
| Nobility Title | comte de Fauquembergue |
Note 1
fils de Jean d' Ypres, seigneur de Reninghes et Mahaut d' Aire