English: Arms of Edward, 4th Duke of York, before he became King Edward IV. Used by his daughters as their paternal arms, including Princess Elizabeth of York, and bastard son Arthur Plantagenet, 1st Viscount Lisle. Quarterly 1st: Arms of King Edward III; 2nd & 3rd: Or a cross gules (de Burgh), 4th: Barry or and azure, on a chief of the first two pallets between two base esquires of the second over all an inescutcheon argent (Mortimer) ([1])

The arms of Edward, 4th Duke of York (later King Edward IV), emphasise his descent from Lionel of Antwerp, 1st Duke of Clarence (1338–1368), third son of King Edward III (on which basis the House of York claimed the throne), who married Elizabeth de Burgh, 4th Countess of Ulster (1332–1363). Their daughter Philippa de Burgh married Edmund Mortimer, 3rd Earl of March, whose son Roger de Mortimer, 4th Earl of March, was the great-grandfather of Edward, 4th Duke of York (later King Edward IV)