It is said that MINAMOTO no Yorimitsu who is a direct descendant of the Seiwa-Genji (Minamoto clan) cut off with this sword the head of Shuten Doji, a devil who lived in Mt. Oe in Tanba Province.
清和源氏の嫡流である源頼光は、丹波国大江山に住み着いた鬼、酒呑童子の首をこの刀で切り落としたという。