Mahaut was born about 1205, the daughter of Guillaume de Fiennes and Agnès de Dammartin. The place is not known.
Her husband was Baudouin III de Guînes, who she married in ABT 1220. The place has not been found. Their five known children were Mahaut (c1225-1262), Adelvis (?-?), Baudouin (?-?), Yde (?-?) and Arnould III (c1225-1283).
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Mahaut de Fiennes |
Guillaume de Fiennes |
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Agnès de Dammartin |
Albéric II de Dammartin |
Albéric II de Mello |
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Jeanne Basset |
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Mathilde de Clermont |
Renaud II de Clermont |
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Clémence de Bar |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Birth | ABT 1205 |
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