During the Middle Ages the crowns worn by English kings had been described as both closed (or arched) and open designs. 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 of England 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. The use of a closed crown may have been adopted by the English as a way of distinguishing the English crown from the French crown, but it also had other meanings to some. For example, Henry V of England wore a helmet-crown of the arched type at the Battle of Agincourt which the French knight St. Remy commented was "like the imperial crown".