sentences:  This line ended in 1471 when King Henry VI's son Edward of Westminster, Prince of Wales was killed at the Battle of Tewkesbury and when he himself was deposed by his third cousin Edward, 4th Duke of York of the York faction (great-grandson of Edmund of Langley, 1st Duke of York, 5th son of King Edward III), who reigned as King Edward IV.The Lancaster kings also had Plantagenet ancestry on the female side from Blanche of Lancaster, wife of John Gaunt, daughter of Henry of Grosmont, 1st Duke of Lancaster (–1361), descended from Edmund Crouchback, 1st Earl of Lancaster, the second son of King Henry III (1216–1272), the great-grandfather of King Edward III.A legend was developed, although without foundation, claiming that Edmund Crouchback was older than his brother King Edward I and had been passed over in the succession because of physical infirmity.