a short summary from Wikipedia;

John of Gaunt (Ghent), 1st Duke of Lancaster, KG

Successor: Henry IV Bolingbroke, King of England (2nd Duke of Lancaster and of Aquitaine)

Spouse:

Blanche of Lancaster

m. 1359; dec. 1369

Infanta Constance of Castile

m. 1371; dec. 1394

Katherine Swynford

m. 1396; wid. 1399

Issue:

Philippa, Queen of Portugal

Elizabeth, Duchess of Exeter

Henry IV Bolingbroke, King of England

Catherine, Queen of Castile

John Beaufort, 1st Earl of Somerset

Cardinal Henry Beaufort

Thomas Beaufort, Duke of Exeter

Joan Beaufort, Countess of Westmorland

House House of Plantagenet (by birth)

House of Lancaster (founder)

Father Edward III of Windsor, King of England

Mother Philippa of Hainault

Born 6 March 1340(1340-03-06)

Ghent, Belgium

Died 3 February 1399 (aged 58)

Leicester Castle, Leicestershire

Burial St Paul's Cathedral, City of London

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Wikipedia links:

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other links:

http://www.britannia.com/bios/royals/jgdklanc.html

http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=28331470

http://www.geneall.net/U/per_page.php?id=942

http://genealogics.org/getperson.php?personID=I00000812&tree=LEO

http://histfam.familysearch.org/getperson.php?personID=I465&tree=EuropeRoyalNobleHous

http://histfam.familysearch.org/getperson.php?personID=I103&tree=Nixon

http://histfam.familysearch.org/getperson.php?personID=I80355&tree=Welsh

http://www.mathematical.com/gauntjohn1340.htm (which gives his baptism date as his birth date)

http://www.nndb.com/people/826/000094544/

http://www.royalist.info/execute/biog?person=6

http://www.thepeerage.com/p10188.htm#i101878

http://www.tudorplace.com.ar/PLANTAGENET2.htm

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Citations:

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 XII/2, page 908. Hereinafter cited as The Complete Peerage.

2. [S3409] Caroline Maubois, "re: Penancoet Family," e-mail message to Darryl Roger Lundy, 2 December 2008. Hereinafter cited as "re: Penancoet Family."

3. [S11] Alison Weir, Britain's Royal Family: A Complete Genealogy (London, U.K.: The Bodley Head, 1999), page 98. Hereinafter cited as Britain's Royal Family.

4. [S11] Alison Weir, Britain's Royal Family, page 101.

5. [S11] Alison Weir, Britain's Royal Family, page 99.

6. [S125] Richard Glanville-Brown, online <e-mail address>, Richard Glanville-Brown (RR 2, Milton, Ontario, Canada), downloaded 17 August 2005.

7. [S11] Alison Weir, Britain's Royal Family, page 102.

8. [S6] Cokayne, and others, The Complete Peerage, volume I, page 183.

9. [S11] Alison Weir, Britain's Royal Family, page 100.

10. [S6] Cokayne, and others, The Complete Peerage, volume I, page 248.