Béatrix was born about 1075, the daughter of Wauthier d'Ath and Ade de Montdidier. The place is not known.
She died before 1136. The place is not known.
She had two marriages/partners. Her first husband was Gilles de Trazegnies. They were married, but the date and place have not been found. Their only known child was Otton (c1092->1136).
Her second husband was Arnould de Flandre. They were married, but the date and place have not been found. Their only known child was Eustache I (c1115-1192).
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Béatrix d'Ath |
Wauthier d'Ath |
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Ade de Montdidier |
Hilduin IV de Montdidier |
Hilduin II (III) de Montdidier |
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Lasseline d'Harcourt |
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Alix de Roucy |
Èbles I de Roucy |
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Béatrix de Hainaut |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Birth | ABT 1075 |
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| Death | BEF 1136 |
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