| Male John Gaunt Plantagenet |
| Birth | 6 Mar 1340 | St. Bavon Abbey, Ghent, Flanders |
| Death | 03 February 1399 | Leicestershire, England |
| Burial | London, City of London, Greater London, England |
|
| Marriage | ||
| Other Spouse | Blanche of Lancaster | F2572 | |
| Marriage | ||
| Other Spouse | Constance of Castile, Duchess of Lancaster | F3318 | |
| Marriage | 1372 | Roquefort, Landes, Aquitaine, France |
| Father | Edward III of Winsor King of England, Lord of Ireland, Duke of Aquitane, Count of Ponthieu, Lord of Aquitane Plantagenet | F1285 Group Sheet | |
| Mother | Philippa DeHainault | F1285 Group Sheet | |
| Female Katherine Swynford, Duchess of Lancaster |
| Birth | 25 Nov 1350 | |
| Death | 10 May 1403 | |
| Burial | ||
| Father | Paon de Roet, Sir | F4398 Group Sheet | |
| Mother | ||
| Female Joan Plantagenet de Beaufort |
| Birth | 1375 | Chateau de Beaufort, Montmorency-Beaufort, Champagne, France |
| Death | 13 November 1440 | South Yorkshire, England |
| Burial | Lincoln, City of Lincoln, Lincolnshire, England |
|
| Spouse | Ralph Neville, 1st Earl of Westmorland, 4th Baron Neville de Raby, KG PC Earl Marshal | F2541 | |
| Marriage | ||
| Spouse | Robert Ferrers, 2nd Baron Ferrers of Wem | F2540 | |
| Marriage | 1391 | Beaufort-en-Vallée, Anjou |