 This was in contrast with kings of France who always wore an open crown.However, there is academic debate on how often closed crowns were used in England during this period, as the first unequivocal use of the closed crown was by Henry IV at his coronation on 13 October 1399.However his effigy on his tomb in Canterbury Cathedral wears an open crown so the link in England between the style of the crown and its representation as that worn by a king and an emperor was not established.