Catherine De Roet later Swynford, Duchess of Lancaster was born circa 1350 in Belgium to Payn De Roet (c1310-1380) and died 10 May 1403 Lincoln, Lincolnshire, England, United Kingdom of unspecified causes. She married Hugh Ottes Swynford (1340-1372) 1366 JL in England, United Kingdom. She married John of Gaunt, 1st Duke of Lancaster (1340-1399) 13 January 1396 JL in Westminster, Greater London, England, United Kingdom.


  • Phillipa De Roet (c1348-aft1387)


Offspring of Hugh Swynford and Catherine De Roet (1350-1403)  ¢
Name Birth Death Joined with
Thomas Swynford (1367-1432)
Margaret Swynford (c1369-)
Blanche Swynford (c1370-)


Offspring of John of Gaunt, 1st Duke of Lancaster and Catherine De Roet (1350-1403)
Name Birth Death Joined with
John Beaufort, 1st Earl of Somerset (c1373-1410) 1371 16 March 1409 Margaret Holland (1385-1439)
Henry Cardinal Beaufort, Bishop of Winchester (1375-1447)
Thomas Beaufort, 1st Duke of Exeter (1377-1426)
Joan Beaufort (1379-1440) 1379 Château de Beaufort, Haute-Loire, France 13 November 1440 Howden, Yorkshire, England Robert, 3rd Baron Ferrers of Wemme (c1373-1396) Robert, 3rd Baron Ferrers of Wemme (c1373-1396) Ralph de Neville, 1st Earl of Westmorland (c1364-1425)

Footnotes (including sources)

‡ General
Ω Birth
  • "She was probably born in Hainaut in 1349 or 1350"
¢ Children
  • From Wikipedia:

"[Swynford's children] were:

  • Margaret Swynford (born c. 1369), became a nun at the prestigious Barking Abbey in 1377 with help from her future stepfather John of Gaunt, where she lived the religious life with her cousin Elizabeth Chaucer, daughter of the famous Geoffrey Chaucer and Katherine's sister Philippa de Roet.
  • Sir Thomas Swynford (1367–1432), born in Lincoln while his father Sir Hugh Swynford was away on a campaign with John of Gaunt in Castile fighting for Peter of Castile. However, puts Thomas's birth later: "Sir Thomas Swynford1 b. 24 Feb 1372/73, d. 2 Apr 1432"; it cites Alison Weir, 'Britain's Royal Families: The Complete Genealogy' (London, U.K.: The Bodley Head, 1999), page 102.
  • Blanche Swynford, named after the Duchess of Lancaster and a godchild of John of Gaunt. (If, as suggested, she was born after 1375, this date is too late for her to have been fathered by Hugh Swynford, who died in 1371/2. However, since John of Gaunt obtained a dispensation for his marriage to Katherine for being Blanche Swynford's godfather, this theory can be discarded).

Although Thomas married twice, Hugh apparently had no grandchildren.

In 1846 Thomas Stapleton suggested that there was a further daughter named Dorothy Swynford, born c. 1366, who married Thomas Thimelby of Poolham near Horncastle, Lincolnshire, Sheriff of Lincolnshire in 1380, but there is no current evidence to support this claim.

Yewenyi, Robin Patterson