Mahaut was born about 1115, the daughter of Guillaume II and Mélissende de Picquigny. The place is not known.
Her husband was Arnould I de Guînes. They were married, but the date and place have not been found. Their thirteen known children were Béatrix (?-?), Baudouin II (?-1205), Guillaume (?-?), Manassès (?-?), Siger (?-?), Arnould (?-?), Marguerite (?-1222), Adélaïde (?-?), Euphémie (?-?), Luitgarde (?-?), Mahaut (?-?), Gisèle (?-?) and Agnès (?-?).
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Mahaut de Saint-Omer |
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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| Birth | ABT 1115 |
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