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the Honorable Elizabeth Sophia Heathcote Drummond Willoughby Chronicles of the H...
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the Honorable Elizabeth Sophia Heathcote Drummond Willoughby Chronicles of the House of Willoughby de Eresby (Google eBook), . This is also supported By Robert Vaughan, p. 11-12 of British antiquitiesrevived where she is given as the mother of Meurig ab Idwal.