Issue of Edward III of England – 3 February 1399), 1st Duke of Lancaster, fourth son. 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
Hugh Courtenay (d.1471) of Sir Henry Willington of Umberleigh. He married Margaret Carminow, daughter and co-heiress of Thomas Carminow, by Joan Hill, the daughter of Robert Hill. They had the following issue: Thus the Courtenay estates were divided into four parts. On the death of Edward Courtenay, Earl of Devon, in 1556, the actual heirs to his estates were the following descendants of the four sisters above: Hugh Courtenay (d.1471) Sir Hugh Courtenay (c.1427 – 6 May 1471) of Boconnoc, Cornwall, was MP for Cornwall in 1446 and 1449. He was beheaded after the Battle of Tewkesbury in 1471. He was the second