"Henry, 3rd Earl of Leicester and Lancaster (c. 1281 – 22 September 1345) was an English nobleman, one of the principals behind the deposition of Edward II of England."

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Links:

http://en.wikipedia.org/wiki/Henry_Plantagenet,_3rd_Earl_of_Lancaster

http://fmg.ac/Projects/MedLands/ENGLAND,%20Kings%201066-1603.htm#HenryLancasterdied1345B

http://www.geneall.net/U/per_page.php?id=509

http://histfam.familysearch.org/getperson.php?personID=I1017&tree=EuropeRoyalNobleHous

http://histfam.familysearch.org/getperson.php?personID=I219744&tree=Welsh

http://www.mathematical.com/lancasterhenry1281.html

http://thepeerage.com/p10214.htm#i102139

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Citations:

1.[S106] Royal Genealogies Website (ROYAL92.GED), online ftp://ftp.cac.psu.edu/genealogy/public_html/royal/index.html. Hereinafter cited as Royal Genealogies Website.

2. [S11] Alison Weir, Britain's Royal Family: A Complete Genealogy (London, U.K.: The Bodley Head, 1999), page 75. Hereinafter cited as Britain's Royal Family.

3. [S11] Alison Weir, Britain's Royal Family, pages 76-79.