"Blanche of Lancaster, Duchess of Lancaster (25 March 1345 – 12 September 1368) was an English noblewoman and heiress, daughter of England's wealthiest and most powerful peer, Henry of Grosmont, 1st Duke of Lancaster. She was the first wife of John of Gaunt, 1st Duke of Lancaster, and the mother of King Henry IV of England.

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Links:

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

http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=8043645

http://www.geneall.net/U/per_page.php?id=1010

http://histfam.familysearch.org/getperson.php?personID=I505&tree=EuropeRoyalNobleHous

http://histfam.familysearch.org/getperson.php?personID=I104&tree=Nixon

http://histfam.familysearch.org/getperson.php?personID=I197526&tree=Welsh

http://thepeerage.com/p10189.htm#i101885

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Citations / Sources

1. [S8] Charles Mosley, editor, Burke's Peerage and Baronetage, 106th edition, 2 volumes (Crans, Switzerland: Burke's Peerage (Genealogical Books) Ltd, 1999), volume 1, page 228. Hereinafter cited as Burke's Peerage and Baronetage, 106th edition.

2. [S11] Alison Weir, Britain's Royal Family: A Complete Genealogy (London, U.K.: The Bodley Head, 1999), pages 99-101. Hereinafter cited as Britain's Royal Family.

3. [S712] #1039 Pedigrees of Anglesey and Carnarvonshire Families: with Their Collateral Branches in Denbighshire, Merionethshire (1914), Griffith, John Edwards, (Horncastle, England: W.K. Morton, 1914), FHL book Folio 942.9 D2gr; FHL microfilm 468,334., p. I.

4. [S2411] #11915 British Genealogy (filmed 1950), Evans, Alcwyn Caryni, (Books A to H. National Library of Wales MSS 12359-12360D. Manuscript filmed by the Genealogical Society of Utah, 1950), FHL microfilms 104,355 and 104,390 item 2., book 6 p. F3.

5. [S673] #1079 A History of Monmouthshire from the Coming of the Normans into Wales down to the Present Time (1904-1993), Bradney, Sir Joseph Alfred, (Publications of the South Wales Record Society, number 8. Five volumes in 13. London: Mitchell, Hughes and Clarke, 1904-1993), FHL book 942.43 H2b., vol. 1 p. 6*; vol. 2 p. 25.