His daughter, Joan of Cornwall, married Sir John Howard, from whom the Howard family, Dukes of Norfolk, are descended. The arms of de Cornwall were: Argent, a lion rampant gules ducally crowned or a bordure engrailed sable bezantee, being the arms of Richard, 1st Earl of Cornwall with difference a bordure engrailed.
His daughter, Joan of Cornwall, wedded Sir John Howard, from whom the Howard family, Dukes of Norfolk, are lineage. The arms of de Cornwall were: Argent, a lion rampant gules ducally crowned or a bordure engrailed sable bezantee, being the arms of Richard, 1st Earl of Cornwall with difference a bordure engrailed.