In 1068 (or 1143) when the Imperial Palace was destroyed by fire, this sword was reduced to ashes and was replaced by another sword; however, since the replaced sword was lost again when the Jokyu War occurred, a new sword was forged.
治暦4年（あるいは、康治2年）、内裏焼亡のとき、灰燼に帰し、他の剣をもってこれにかえたが、承久の乱でふたたび紛失し、新鋳した。