other possible birth dates are

19 March 1725

8 March 1726

another possible burial place (according to nndb website) is

St. Paul's Cathedral, London, England

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"Admiral of the Fleet Richard Howe, 1st Earl Howe KG (8 March 1726 – 5 August 1799) was a British naval officer, notable in particular for his service during the American War of Independence and French Revolutionary Wars. He was the brother of William and George Howe."

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Links:

http://en.wikipedia.org/wiki/Richard_Howe,_1st_Earl_Howe

http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=56824521

http://histfam.familysearch.org/getperson.php?personID=I59881&tree=Nixon

http://www.nndb.com/people/368/000103059/

http://thepeerage.com/p2919.htm#i29186

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Citations / Sources:

[S37] Charles Mosley, editor, Burke's Peerage, Baronetage & Knightage, 107th edition, 3 volumes (Wilmington, Delaware, U.S.A.: Burke's Peerage (Genealogical Books) Ltd, 2003), volume 2, page 1986. Hereinafter cited as Burke's Peerage and Baronetage, 107th edition.

[S334] #505 Visitation of England and Wales (1893-1921), Howard, Joseph Jackson, (21 volumes. London: [Joseph Jackson Howard], 1893-1921), FHL book 942 D23h., vol. 18 p. 132.

[S335] #506 Visitation of England and Wales, Notes (1896-1921), Howard, Joseph Jackson, (14 volumes. [London]: Frederick Arthur Crisp, 1896-1921), FHL book 942 D23hn., vol. 13 p. 100.

[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. 6 p. 598.