the insignia of the great japanese empire is composed of three treasures which have been considered sacred , and guarded with jealous care from time immemorial . these are the yatano - no - kagami or the mirror of yata , the yasakami - no - magatama or the jewel of yasakami , and the murakumo - no - tsurugi or the sword of murakumo . of these three treasures of the empire , the sword of murakumo , afterwards known as kusanagi - no - tsrugugi , or the grass - cleaving sword , is considered the most precious and most highly to be honored , for it is the symbol of strength to this nation of warriors and the talisman of invincibility for the emperor , while he holds it sacred in the shrine of his ances
it is the symbol of strength to this nation of warriors and the talisman of invincibility for the emperor .
why was the sword of murakumo considered the most precious ?
why was the sword of murakumo considered the most precious ?