The Futsu-no-Mitama Legend

The Futsu-no-Mitama Legend is a narrative tradition preserved in the *Kojiki* (Records of Ancient Matters, 712 CE), the *Nihon Shoki* (Chronicles of Japan, 720 CE), and related classical texts. It concerns a sacred sword whose spiritual potency came to be venerated at Isonokami Grand Shrine (Isonokami Jingu) in Tenri, Nara Prefecture.

According to these sources, Susanoo-no-Mikoto wielded a sword called the Heavenly Feather-Feather Blade (Ame-no-Hahakiri-no-Tsurugi) or the Ten-Grip Sword (Totsukas-no-Tsurugi) when he defeated the eight-headed serpent (Yamata-no-Orochi). The spiritual essence residing in this blade became known as Futsu-no-Mitama. When Emperor Jinmu's forces were overcome by poisonous vapours from a hostile kami while traversing the Kumano mountains, Takakura-ji-no-Mikoto received a vision revealing that the deity Takemikazuchi-no-Kami had sent down a sword—identified as Futsu-no-Mitama—which restored the emperor to life.

The narrative structure comprises three phases: the origin of the sacred sword through Susanoo's victory; the descent of the spirit-blade during the Kumano crisis and the emperor's revival; and the subsequent enshrinement of Futsu-no-Mitama at Isonokami, where the Mononobe clan maintained ritual oversight. The enshrined kami are recorded as Futsu-no-Mitama-no-Okami, Furu-no-Mitama-no-Okami, and Futsu-shi-Mitama-no-Okami.

Archaeological excavation of the forbidden precincts behind the honden (main hall) in 1874 yielded ancient iron blades and beads, providing material corroboration of the tradition. The legend is also linked with lore concerning Nigihayahi-no-Mikoto, an ancestor revered by the Mononobe clan, whose seat lay in the Furu village area where the shrine stands.