" The Holland family traced their own royal ancestry through Henry IV’s sister Elizabeth. In January 1444 the most senior Holland, John, earl of Huntingdon, was promoted to duke of Exeter, with precedence over all other dukes except for York—another elevation specifically credited to his closeness in blood to the king. John Holland died in August 1447, and his son Henry Holland eventually succeeded to his duchy. "

― Dan Jones , The Wars of the Roses: The Fall of the Plantagenets and the Rise of the Tudors