Beatrix was the daughter of Simon III de Lalaing and Mahaut d'Aspremont. The date and place of her birth have not been found.
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Simon III de Lalaing |
sir Nicolas II de Lalaing |
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Agnès de Willerval |
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Mahaut d'Aspremont |
Joffroi III d'Aspremont |
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Isabelle de Quiévrain |
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