Amaterasu-O-mi-Kami, the sun goddess, decided to let her grandson Niningi-no Mikoto govern her lands. Before his arrival the deity Futsunushi no Kami was send down to earth to prepare the lands for their rightful heir.
However the deity of thunder Take-mika-tsuchi, the first descendant of the deity of fire, was furious with this decision because he thought himself more brave and fabulous than Futsunushi-no-Kami, and therefore more suitable for this important task. The celestial gods approved his wishes due to their appreciation of his enormous strength. So both Take-mika-tsuchi and Futsunushi-no-Kami were send down to earth in the name of Ninigio-no-Mikoto to confiscate the lands of wide stretched meadows, the realm of the eight islands (modern Japan).
The deities descended to earth to arrive in the vicinity of Itasa in the province of Izumo, where the planted the divine sword with the grip down in the earth. They kneeled before the sword and vowed their loyalty to the gods.
It is believed that these deities landed at the towns Katori and Kashima.
Futsunushi-no-Kami at Katori and Take-mika-tsuchi at Kashima. In honour of these two deities of war two Shinto shrines were built in these towns. Throughout many centuries famous sword fighters prayed and meditated at these shrines to gain insight into their martial arts.
Two of the most important martial art school of Japan were established in the vicinity of these shrines, the Tenshinsho-den Katori Shinto Ryu and the Kashima Shinto Ryu.