The party of the Sumera-mikoto went upwards north and arrived at the port Oka, now Ashiya, in November 9th 667 B. C.. Thus, the next place of their sojourn was this port Oka in Tukushi. By the way, according to the Kojiki, they erected the Okada palace there and stayed for one year. Toshihiko-Uda, who was a Shintoist in connection with Takakura-shrine in Tukushi, stated that the reason of his stay must have to be for shipbuilding preparing for their expedition.
It is plausible to regard the tradition of the marriage between Ama-no-tane-no-mikoto and Usa-tu-hime as a symptom of fusion between the descendants from the Heaven and indigenous persons from earthy deities. Nowadays, Usa shrine is well-known for its contribution to maintenance of the legitimacy of the lineage of the Tennow in 8th century.
At the banquet given by Usa-tu-hiko, the Sumera-mikoto married Usa-tu-hime with one of his attendant, Ama-no-tane-no-mikoto. Ama-no-tane-no-mikoto was an ancestor of Nakatomi tribe, among whom Nakatomi-no-kamatari, noted for a leading player of the Issi Reformation in 7th century, came to appear in great numbers.
Leaving the port Hayasuinato, the force of the Sumera-mikoto arrived at Usa in the Tukushi, the northern part of the Kyuusyuu. Usa was name of a region where Usa-tu-hiko, who was an ancestor of Usa-no-kunituko, had ruled. Usa-tu-hiko erected a palace called Ashihitotuagari-no-miya and gave a banquet for the party of the Sumera-mikoto with Usa-tu-hime, maybe one of daughters of Usa-tu-hiko.
The story of Shine-tu-hiko suggests us that authority of the descendant of deities from the Heaven was prevailing over the nation, at least in the West part of it. The blaze of fame as descendants of deities seems to make it possible for the party of Sumera-mikoto to gain earth deities over to his side and engaged them as specialists necessary for his achievement of the expedition.
Uzu-hiko, the earthy deity of the port Hayasuinato, explained to the Sumera-mikoto that he came to see him because he had heard information that a descendant of deities from the Heaven was to arrive at the port soon. Hearing his words, the Sumera-mikoto required him to be a pilot for his troop. With pleasure, he accepted the proposal. The Sumera-mikoto, with pulling him into his ship with a rod made by Shii, chinquapin, appointed him a pilot by imperial order and bestowed him an anew name, Shine-tu-hiko. Shinetu-hiko was said to become an ancestor of Yamato-no-Atai tribe.
Both of two Japanese history books left the descriptions about the route of the expedition of Kamiyamato-iware-hiko-no-mikoto from Himuka towards the East. In the first place, the complier of the Chroicle of Japan says, that when the imperial troop arrived at the port Hayasuinato, they looked at a boat which a fisherman rowed coming near. The Sumera-mikoto invited him and asked some questions. This fisherman politely introduced himself that he was an earthy deity reign over the district and his name was Uzu-hiko.
By the way, the complier of the Chronicle of Japan alters the style of editing from the third volume. He no longer enumerates different legends parallel with the main story. It is interesting for us that simultaneously with the appearance of the Jimmu Tennow, who was the founding father of Japan, histories, which would have been transmitted within several mighty tribes, was unified into the national history also.
It seems that each of these three abstract conceptions, the Heaven, the Earth and the Sea would have corresponded to three exalted deities, and moreover to ancient prominent and main nations, the Na-no-kuni, Izumo-no-kuni and Ku-na-kuni respectively, even though it would have been an idea of the complier of the Chronicle of Japan. It is likely that he would have described the Japanese mythology with intention to depict the process of ancient Japanese integration.
Furthermore, the hypothesis that national foundation of Japan would have related with three parties, the Heaven, the Earth and the Sea remind us the mythology that Izanami-no-mikoto and Izanami-no-mikoto, or Izanami-no-mikoto solely bore the three exalted deities, the sun goddess Amaterasu-oomikami, the moon god Tukiyomi-no-mikoto and the earth god Susanow-no-mikoto.
