According to the Ryukyuan official history ''[[Kyuyo|Kyûyô]]'', the defeated king of [[Hokuzan]] killed himself with this sword in [[1416]], when his kingdom was conquered by [[Chuzan|Chûzan]]. | According to the Ryukyuan official history ''[[Kyuyo|Kyûyô]]'', the defeated king of [[Hokuzan]] killed himself with this sword in [[1416]], when his kingdom was conquered by [[Chuzan|Chûzan]]. |