Lady Margaret Beaufort, Countess of Devon

Two of her nieces were also named Margaret Beaufort. Margaret Beaufort, Countess of Stafford was the mother of Henry Stafford, 2nd Duke of Buckingham and Margaret Beaufort, Duchess of Suffolk, Countess of Richmond and Derby was the mother of Henry VII.

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Links:

http://en.wikipedia.org/wiki/Margaret_Beaufort,_Countess_of_Devon

http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=113262589

http://www.thepeerage.com/p10273.htm

http://www.tudorplace.com.ar/BEAUFORT.htm#Margaret%20BEAUFORT%20%28...

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Citations / Sources:

[S11] Alison Weir, Britain's Royal Families: The Complete Genealogy (London, U.K.: The Bodley Head, 1999), page 106-107