Roger Mortimer, 4th Earl of March, senior heir of the female line, the grandson of Lionel of Antwerp, but this succession never took place as Richard II was eventually deposed and succeeded by another of Richard's cousins, Henry Bolingbroke (who ascended as Henry IV), who was senior heir of the male line. William of Hatfield (1336–1337) William of Hatfield (13361337), second son, was born at Hatfield near Doncaster in the West Riding of Yorkshire late in 1336, where Edward III kept Christmas with Queen Philippa. He was baptised by William Melton, Archbishop of York, but died soon afterwards. He was buried at York Minster on 10 February 1337, where survives his monument with effigy in the north quire aisle, the position of his burial being unknown. Lionel of Antwerp, Duke of Clarence (1338–1368) Lionel of Antwerp, 1st Duke of Clarence (29 November 13387 October 1368), third son. He also predeceased his father. Lionel's only child, Philippa, was acquired as a wife by the powerful Mortimer family, which as noted above had exerted enormous influence during the reigns of Edward II and Edward III. Philippa's son Roger Mortimer, 4th Earl of March, was the designated heir of King Richard II but predeceased him, leaving his young son Edmund as heir presumptive. Anne Mortimer, Edmund Mortimer's eldest sister and Lionel of Antwerp's great-granddaughter, married Richard, Earl of Cambridge, of the House of York, merging the Lionel of Antwerp/Mortimer line into the York line. John of Gaunt, 1st Duke of Lancaster (1340–1399) John of Gaunt (6 March 13403 February 1399), 1st Duke of Lancaster, fourth son. Legitimate male heirs (Lancaster) From the marriage of John of Gaunt and Blanche of Lancaster, daughter and heiress of the Duke of Lancaster, descended legitimate male heirs, the Lancasters (King Henry IV (1399–1413), who as Henry of Bolingbroke in 1399 deposed his first cousin King Richard II (1377–1399), and was followed by his son King Henry V (1413–1422) and the latter's son King Henry VI (1422–1471). 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