"John Beaufort, 1st Duke of Somerset, KG (1403 – 27 May 1444) was an English noble and military commander."

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Links:

http://en.wikipedia.org/wiki/John_Beaufort,_1st_Duke_of_Somerset

http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=18690

http://histfam.familysearch.org/getperson.php?personID=I274&tree=EuropeRoyalNobleHous

http://histfam.familysearch.org/getperson.php?personID=I1769&tree=PagetHeraldicBaronag

http://www.luminarium.org/encyclopedia/johnbeaufort.htm

http://www.thepeerage.com/p10198.htm#i101976

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Citations / Sources:

1. [S11] Alison Weir, Britain's Royal Family: A Complete Genealogy (London, U.K.: The Bodley Head, 1999), page 103. Hereinafter cited as Britain's Royal Family.

2. [S6] G.E. Cokayne; with Vicary Gibbs, H.A. Doubleday, Geoffrey H. White, Duncan Warrand and Lord Howard de Walden, editors, The Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Extant, Extinct or Dormant, new ed., 13 volumes in 14 (1910-1959; reprint in 6 volumes, Gloucester, U.K.: Alan Sutton Publishing, 2000), volume II, page 45. Hereinafter cited as The Complete Peerage.