In April 1483 he bore the royal banner at the funeral of King Edward IV. He supported Richard III's accession to the throne, and was appointed Lord High Steward. He bore the crown before Richard at his coronation, while his eldest son, the Earl of Surrey, carried the Sword of State. On 28 June 1483 he was created Duke of Norfolk, third creation, the first creation having become extinct on the death of John de Mowbray, 4th Duke of Norfolk, in 1476, and the second creation having been invalidated by Richard's illegitimisation, on 25 June 1483, of Edward IV's second son Richard of York. This left John Howard as heir to the duchy, and his alliance with Richard ensured his acquisition of the title. He was also created Earl Marshal, and Lord Admiral of all England, Ireland, and Aquitaine.