"Margaret Holland, Countess of Somerset (1385 – 31 December 1439) was the daughter of Thomas Holland, 2nd Earl of Kent, who was the son of Joan "the Fair Maid of Kent" (granddaughter of Edward I of England, wife of Edward the Black Prince and mother of Richard II of England). Margaret's mother was Alice FitzAlan, daughter of Richard FitzAlan, 10th Earl of Arundel and Eleanor of Lancaster."

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Links:

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

http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=46305472

http://www.geneall.net/U/per_page.php?id=8980

http://www.genealogy4u.com/genealogy/getperson.php?personID=I351&tree=western2007

http://histfam.familysearch.org/getperson.php?personID=I334&tree=EuropeRoyalNobleHous

http://www.thepeerage.com/p10224.htm

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Citations:

1. [S8] Charles Mosley, editor, Burke's Peerage and Baronetage, 106th edition, 2 volumes (Crans, Switzerland: Burke's Peerage (Genealogical Books) Ltd, 1999), volume 1, page 220. Hereinafter cited as Burke's Peerage and Baronetage, 106th edition.

2. [S11] Alison Weir, Britain's Royal Family: A Complete Genealogy (London, U.K.: The Bodley Head, 1999), page 102. Hereinafter cited as Britain's Royal Family.

3. [S11] Alison Weir, Britain's Royal Family, page 103.

4. [S11] Alison Weir, Britain's Royal Family, page 104.