Emperor Sujin
During the reign of Emperor Sujin, duplicate copies of the Imperial regalia were made in order to safeguard the originals from theft. This fear of theft proved to be justified during the reign of Emperor Tenji when the sacred sword was stolen from Atsuta; and it was not to be returned until the reign of Emperor Tenmu. Although not seen by the general public since that time, it is said to have remained in safekeeping at the shrine up to the present day.