Guillaume was born in 1145, the son of Guillaume III and Mathilde. The place is not known.
He died in 1191/92. The place is not known.
He had two marriages/partners. His first wife was Ide d'Avesnes. They were married, but the date and place have not been found. Their only known child was Ide (?-?).
His second wife was Marie d'Antioche. They were married, but the date and place have not been found. They had no known children.
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Guillaume IV |
Guillaume III |
Guillaume II |
Guillaume I |
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Mélissende de Picquigny |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Birth | 1145 |
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| Death | 1191/92 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|---|
| Nobility Title | châtelain de Saint-Omer | |||||
| Nobility Title | seigneur de Fauquembergues |
Note 1
Châtelain de Saint-Omer après son frère Gautier