Henry of Lancaster [Henry of Grosmont], first duke of Lancaster (c. 1310–1361), soldier and diplomat, was the son of Henry, third earl of Lancaster (c. 1280–1345), and Maud Chaworth (d. 1317×22).
W. M. Ormrod
Margaret, duchess of Burgundy (1446–1503), Yorkist matriarch and mediator, was the third daughter of Richard, third duke of York (1411–1460), and Cecily (1415–1495), daughter of Ralph Neville, first earl of Westmorland. She was born on 3 May 1446, probably at Fotheringhay Castle, Northamptonshire...
Plantagenet, Arthur, Viscount Lisle (b. before 1472, d. 1542), soldier, diplomat, and administrator, was the illegitimate son of Edward IV (1442–1483).
The identity of Arthur's mother and his date of birth have given rise to much speculation. The editor of his correspondence, Muriel St Clare Byrne...