other possible death year was 1400

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"Thomas de Mowbray, 1st Duke of Norfolk, KG, Lord Marshal and Earl Marshal (22 March 1366 – 22 September 1399) was an English nobleman, noted for his involvement in the power struggles leading up to the fall of king Richard II."

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Links

http://en.wikipedia.org/wiki/Thomas_de_Mowbray,_1st_Duke_of_Norfolk

http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=51811179

http://histfam.familysearch.org/getperson.php?personID=I871&tree=Nixon

http://histfam.familysearch.org/getperson.php?personID=I113161&tree=Welsh

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

http://thepeerage.com/p196.htm#i1958

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Citations / Sources:

1. [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 I, page 253. Hereinafter cited as The Complete Peerage.

2. [S452] #21 The Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Extant, Extinct, or Dormant (1910), Cokayne, George Edward (main author) and Vicary Gibbs (added author), (New edition. 13 volumes in 14. London: St. Catherine Press,1910-), vol. 2 p. 132.

3. [S266] #379 [7th edition, 1992] Ancestral Roots of Certain American Colonists, Who Came to America Before 1700 (7th edition, 1992), Weis, Frederick Lewis, (7th edition. Baltimore: Genealogical Publishing Company, c1992), FHL book 974 D2w 1992., p. 19 line 15:32, p. 20 line 16:32.

4. [S394] #230 [5th edition, 1999] The Magna Charta Sureties, 1215 (5th edition, 1999), Adams, Arthur, (5th edition. Baltimore: Genealogical Publishing, 1999), FHL book 973 D2aa 1999., p. 27 line 19:8, p. 82 line 63:7.

5. [S347] Plantagenet Ancestry of Seventeenth-century Colonists: the Descent from the Later Plantagenet Kings of England, Henry III, Edward I, Edward II, and Edward III, of Emigrants from England and Wales to the North American Colonies Before 1701 (2nd ed., 1999), Faris, David, (2nd edition. Boston: New England Historic Genealogical Society, 1999), FHL book 973 D2fp., p. 248 MOWBRAY:9.

6. [S452] #21 The Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Extant, Extinct, or Dormant (1910), Cokayne, George Edward (main author) and Vicary Gibbs (added author), (New edition. 13 volumes in 14. London: St. Catherine Press,1910-), vol. 1 p. 30, 253, 256 fn. (d); vol. 4 appndx. H chart II; vol. 5 p. 10 fn. (a).

7. [S394] #230 [5th edition, 1999] The Magna Charta Sureties, 1215 (5th edition, 1999), Adams, Arthur, (5th edition. Baltimore: Genealogical Publishing, 1999), FHL book 973 D2aa 1999., p. 27 line 19:8, p. 82 line 63:7, p. 85 line 66:7.

8. [S347] Plantagenet Ancestry of Seventeenth-century Colonists: the Descent from the Later Plantagenet Kings of England, Henry III, Edward I, Edward II, and Edward III, of Emigrants from England and Wales to the North American Colonies Before 1701 (2nd ed., 1999), Faris, David, (2nd edition. Boston: New England Historic Genealogical Society, 1999), FHL book 973 D2fp., p. 145 FITZ ALAN:11, p. 248 MOWBRAY:9.

9. [S394] #230 [5th edition, 1999] The Magna Charta Sureties, 1215 (5th edition, 1999), Adams, Arthur, (5th edition. Baltimore: Genealogical Publishing, 1999), FHL book 973 D2aa 1999., p. 27 line 19:8.