Katherine Swynford › Children
John Beaufort, 1st Earl of Somerset
Joan Beaufort, Countess of Westmorland
Thomas Beaufort, Duke of Exeter
Henry Beaufort
Blanche Swynford
Dorothy Swynford (?)
Margaret Swynford (?)
Thomas Swynford
Third wife of John of Gaunt, Duke of Lancaster
Katherine Swynford, Duchess of Lancaster was the third wife of John of Gaunt, Duke of Lancaster, the fourth son of King Edward III. Wikipedia