Sir John of Gaunt, K.G., Duke of Lancaster, etc.

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Sir John of Gaunt, K.G., Duke of Lancaster, etc., son of Edward III, King of England and Philippa Hainault, was born at St Bavon's Abbey, Ghent, Flanders, Belgium, March 1340.1,2 He died at Leicester Castle, Leicestershire, England, 3 February 1398/99,3,2 and was buried with his 1st wife at St Paul's Cathedral, London, England, 16 March 1398/99.3

John married (1) Blanche of Lancaster, daughter of Sir Henry of Lancaster, K.G., Earl of Lancaster and Isabel de Beaumont, 13 May 1359;1 he married (2) Constance of Castile-León, daughter of Pedro I "the Cruel," King of Castile and María de Padilla, before 29 September 1371;4 he married (3), as her 2nd husband, Katherine de Roet, daughter of Gilles dit Paonet de Roet, at Lincoln Cathredral, Lincolnshire, England, 13 January 1395/96.3,2

He also had an early mistress, Mary de Saint Hilaire, by whom he had one daughter.1

For more information about Sir John of Gaunt, K.G., Duke of Lancaster, etc., please see this Wikipedia article.

Family 1

Mary de Saint Hilaire d. aft. 1413
  • Blanche of Lancaster5 d. aft. 23 Jan 1386

Family 2

Blanche of Lancaster b. aft. 1298, d. 12 Sep 1368
  • Elizabeth of Lancaster1 b. aft. 1360
  • Philippe1 b. 31 Mar 1360
  • John1 b. abt. 1362, d. bef. 13 Apr 1373
  • Edward of Lancaster1 b. abt. 1365, d. bef. 13 Apr 1373
  • John of Lancaster1 b. bef. 4 May 1366, d. bef. 13 Apr 1373
  • Henry IV, King of England1 b. abt. 15 Apr 1367, d. 20 Mar 1412/13

Family 3

Constance of Castile-León b. 1354, d. 24 Mar 1394
  • Katherine of Lancaster6 b. bef. 31 Mar 1373, d. 2 Jun 1418

Family 4

Katherine de Roet b. 1350, d. 10 May 1403
  • Sir John Beaufort, K.G., Earl of Somerset7 d. 16 Mar 1409/10
  • Sir Thomas Beaufort, K.G., Earl of Dorset8
  • Henry Beaufort, Cardinal of England9 b. say 1374, d. 11 Apr 1447
  • Joan Beaufort+4 b. abt. 1379, d. 13 Nov 1440
This person was last edited on27 Jun 2021


  1. [S1947] Douglas Richardson, Royal Ancestry: A Study in Colonial and Medieval Families (Five vols., Salt Lake City, Utah: s.p., 2013), 3:490 (Lancaster 10), further cited as Richardson, Royal Ancestry.
  2. [S1972] Neil D. Thompson and Charles M. Hansen, The Ancestry of Charles II, King of England: A Medieval Heritage [Twelve Generations] (Saline, Michigan: McNaughton & Gunn, 2012), #532, further cited as Thompson and Hansen, The Ancestry of Charles II.
  3. [S1947] Richardson, Royal Ancestry, 3:492 (Lancaster 10).
  4. [S1947] Richardson, Royal Ancestry, 3:491 (Lancaster 10).
  5. [S1947] Richardson, Royal Ancestry, 3:499 (Lancaster10.i).
  6. [S1947] Richardson, Royal Ancestry, 3:497 (Lancaster 10.i).
  7. [S1947] Richardson, Royal Ancestry, 3:497 (Lancaster10.i).
  8. [S1947] Richardson, Royal Ancestry, 3:497 (Lancaster10.iii).
  9. [S1947] Richardson, Royal Ancestry, 3:497 (Lancaster10.ii).