her birth date isn't very clear.

one possible date from merges is 18 June 1318

Wikipedia have 11 September 1318 as the birth date

other sources only give her birth year as 1311

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Burial of Eleanor and Richard

Eleanor died at Arundel (January 1372), followed by Richard (January 1376), and they were both buried at Lewes Chapter House. After the dissolution of the monasteries, their tomb was removed to Chichester Cathedral 

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Links:

http://en.wikipedia.org/wiki/Eleanor_of_Lancaster

http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=84727967

http://histfam.familysearch.org/getperson.php?personID=I925&tree=Nixon

http://histfam.familysearch.org/getperson.php?personID=I143125&tree=Welsh

http://thepeerage.com/p10690.htm#i106892

http://www.tudorplace.com.ar/PLANTAGENET.htm#Eleonor%20PLANTAGENET%20%28C.%20Arundel%29

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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 78. 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 60. Hereinafter cited as The Complete Peerage.

3. [S11] Alison Weir, Britain's Royal Family, page 79.

4. [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. 243-244 fn. (d), 244, 253; vol. 2 p. 61; vol. 4 appndx. H chart II; vol. 14 p. 38 [ARUNDEL], 259.

5. [S338] Plantagenet Ancestry: A Study in Colonial and Medieval Families (2004), Richardson, Douglas, edited by Kamball G. Everingham, (Baltimore: Genealogical Publishing Company, 2004), FHL book 942 D5rd., p. 41 ARUNDEL:10.

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. 244; vol. 2 p. 61.

7. [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. 143 FITZ ALAN:13.

8. [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. 60.

9. [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. 21 line 17:30, p. 23 line 20:30, p. 65 line 60:32.

10. [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. 243; vol. 2 p. 61.