Katherine de Roet, Duchess of Lancaster

Abt 1350 - 1403  (53 years)

• Name	Katherine de Roet
  Suffix	Duchess of Lancaster
  Birth	Abt 1350
  Gender	Female
  mtDNA	J1c2c3
  Reference Number	11716
  Death	10 May 1403
  Person ID	I11716	KLD Genealogy
  Last Modified	10 Apr 2026

  
  

  Father	Payne de Roet, Sir,   b. Abt 1310   d. 1380 (Age 70 years)
  Relationship	bio
  Family ID	F9666	Group Sheet  |  Family Chart

  
  

  Family 1	Hugh Swynford
  Children	1. Blanche Swynford,   b. UNKNOWN   d. UNKNOWN  [Father: bio]  [Mother: bio]   2. Thomas Swynford, Sir,   b. 1367   d. 1432 (Age 65 years)  [Father: bio]  [Mother: bio]   3. Margaret Swynford,   b. Abt 1369   d. UNKNOWN  [Father: bio]  [Mother: bio]
  Family ID	F4279	Group Sheet  |  Family Chart
  Last Modified	10 Apr 2026

  
  

  Family 2	John of Gaunt, Duke of Lancaster Duke of Aquitaine,   b. 6 Mar 1340, Ghent, Flanders d. 3 Feb 1399, Leicester Castle, Leicestershire, England (Age 58 years)
  Marriage	1396
  	Former Mistress - Their children were legitimized by decree of Richard II, but not allowed to inherit the throne
  Children	+ 1. John Beaufort, 1st Earl of Somerset 1st Marquess of Somerset 1st Marquess of Dorset KG,   b. Abt 1371, Beaufort, Champagne, France d. 16 Mar 1410, London, England (Age 39 years)  [Father: bio]  [Mother: bio] + 2. Henry Beaufort, Cardinal Beaufort,   b. 1375   d. 1447 (Age 72 years)  [Father: bio]  [Mother: bio]   3. Thomas Beaufort, Duke of Exeter,   b. 1377   d. 1426 (Age 49 years)  [Father: bio]  [Mother: bio] + 4. Joan Beaufort, Countess of Westmorland,   b. Abt 1379   d. 1440 (Age 61 years)  [Father: bio]  [Mother: bio]
  Family ID	F4276	Group Sheet  |  Family Chart
  Last Modified	10 Apr 2026