"Katherine Swynford, Duchess of Lancaster (also spelled Synford), née (de) Roet (also spelled (de) Rouet, (de) Roët, or (de) Roelt) (probably 25 November 1350 – 10 May 1403), was the daughter of Sir Payne (or Paen/Pain/Paon) (de) Roet (also spelled (de) Rouet, (de) Roët or (de) Roelt), originally a Flemish herald from County of Hainaut, later knighted.

Katherine became the third wife of John of Gaunt, Duke of Lancaster, and their descendants were the Beaufort family, which played a major role in the Wars of the Roses. Henry VII, who became King of England in 1485, derived his claim to the throne from his mother Lady Margaret Beaufort, who was a great-granddaughter of Gaunt and Katherine Swynford."

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Wikipedia links:

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other links:

http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=20205

http://www.geneall.net/U/per_page.php?id=8653

http://www.genealogy4u.com/genealogy/getperson.php?personID=I559&tree=western2007

http://histfam.familysearch.org/getperson.php?personID=I455&tree=EuropeRoyalNobleHous

http://histfam.familysearch.org/getperson.php?personID=I109&tree=Nixon

http://www.mathematical.com/roetcatherine1350.htm

http://www.nndb.com/people/343/000098049/

http://www.royalist.info/execute/biog?person=16

http://www.thepeerage.com/p10197.htm#i101970

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Citations:

1. [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.

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 XII/2, page 547. Hereinafter cited as The Complete Peerage.