Guillaume was the son of Guillaume II and Mélissende de Picquigny. The date and place of his birth have not been found.
He died about 1170. The place is not known.
His wife was Mathilde. They were married, but the date and place have not been found. Their two known children were Guillaume IV (1145-1191/92) and Guillaume V (?-1245).
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Guillaume III |
Guillaume II |
Guillaume I |
Baudouin I de Saint-Omer |
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Mélissende de Picquigny |
Eustache de Picquigny |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Death | ABT 1170 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | châtelain de Saint-Omer |