Blanche was the daughter of Hugh Swynford and Katherine de Roët. The date and place of her birth have not been found.
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Katherine de Roët |
sir Paon de Roët |
Payen de Roët |
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Catherine d'Avesnes |
Guillaume de Hainault |
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Jeanne de Valois |
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| John Plantagenêt (earl of Richmond, earl of Leicester, Lancaster and Derby, duke of Lancaster 1°, de facto King of Galicia, duc d'Aquitaine) | godfather |