Guillaume was the son of Baudouin I de Saint-Omer and Étienette de Provence. The date and place of his birth have not been found.
He died about 1127. The place is not known.
His wife was Aganitrude van Brugge. They were married, but the date and place have not been found. Their only known child was Guillaume II (?-c1148).
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Guillaume I |
Baudouin I de Saint-Omer |
Rabel de Saint-Omer |
Lambert I de Saint-Omer |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Death | ABT 1127 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|---|
| Nobility Title | châtelain de Saint-Omer |