Born 24 February 1367 and baptised 25 February 1367 at Church of St Margaret, Lincoln Cathedral. Alison Weir discusses the claimed birth dates for Thomas in Katherine Swynford pp. 79-81.[1]
Sources
↑ Weir, Alison. Katherine Swynford : The Story of John of Gaunt and His Scandalous Duchess. London: Vintage Books, 2008, pp. 79-81.
Douglas Richardson, Royal Ancestry: A Study in Colonial and Medieval Families, 5 vols., ed. Kimball G. Everingham (Salt Lake City, Utah: the author, 2013), Vol. IV page 503 Footnote 22
Footenote 22: Edward Grimston, Esq., married (2nd) 26 Sept. 1459 Mary Drury, daughter of William Drury, Knt., by Katherine, daughter of Thomas Swynford, Knt. Mary Drury's great grandmother was Katherine de Roet, wife successively of Hugh de Swynford, Knt., and John of Gaunt, Duke of Aquitaine and Lancaster.
Alison Weir, Britain's Royal Families: The Complete Genealogy (London, U.K.: The Bodley Head, 1999), p. 102.
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 IV, page 64.
Royal Ancestry by Douglas Richardson Vol. V pp. 373, 390
Sir Thomas Swynford Truitt Family Tree again.ged on 13 Aug 2010. Ancestry Family Trees S-2093685953 (1367–1432)
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DNA Connections
It may be possible to confirm family relationships with Thomas by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA test-takers in his direct paternal line.
Mitochondrial DNA test-takers in the direct maternal line: