| Male Duke of Lancaster John Plantagenet |
| Birth | Mar 1340 | St. Bavon's Abbey, Ghent, Flanders, Netherlands |
| Death | 3 Feb 1399 | Leicester Castle, Leicester, Leicestershire, England, United Kingdom |
| Burial | ||
| Marriage | 13 Jan 1396 | Lincoln Cathedral, Lincoln, Lincolnshire, England, United Kingdom |
| Other Spouse | Countess of Derby Blanche Plantagenet | F1800 | |
| Marriage | 19 May 1359 | Reading Abbey, Reading, Berkshire, England, United Kingdom |
| Father | King of England Edward Plantagenet, III | F1600 Group Sheet | |
| Mother | Philippa, of Hainault | F1600 Group Sheet | |
| Female Catherine Swynford Roet |
| Birth | 1350 | |
| Death | 10 May 1403 | Lincoln, Placer, California, United States |
| Burial | ||
| Father | Sir Payne Roet | F2024 Group Sheet | |
| Mother | ||
| Male + Earl of Somerset John Beaufort |
| Birth | 1373 | |
| Death | 16 Mar 1410 | St. Katherine by the Tower, London, Greater London, England, United Kingdom |
| Burial | ||
| Spouse | Margaret Holland | F1801 | |
| Marriage | 28 Sep 1397 | |
| Female + Joan Beaufort |
| Birth | 1379 | Westminster, Middlesex, England, United Kingdom |
| Death | 15 Jul 1445 | Dunbar Castle, Dunbar, East Lothian, Scotland, United Kingdom |
| Burial | ||
| Spouse | James Steward | F2022 | |
| Marriage | 1438 | Saint Andrews, Scotland, United Kingdom |