 His son John (died 1376) married Margaret, daughter of King Edward III, and on the death without issue of his grandson in 1389, the Earldom of Pembroke reverted again to the Crown.Humphrey, the fourth son of King Henry IV, was created Duke of Gloucester and Earl of Pembroke for life, these titles being subsequently made hereditary, with a reversion as regards the Earldom of Pembroke, in default of heirs to Humphrey, to William de la Pole, 1st Duke of Suffolk.On the death of Humphrey without legitimate issue in 1447, William de la Pole became Earl of Pembroke.