Isejingu

The tale of the descent to earth of the descendants of Amaterasu Omikami, and of the 1st Emperor Jinmu

Okuninushi-no-kami, a descendant of the deity Susanoo-no-kami living in Izumo, unified almost all the areas of the world and established the land called Ashihara-no-Nakatsukuni, i.e., ancient Japan. Amaterasu Omikami, the ruler of the Heavenly Plain, decided to send her offspring to govern the land and renew it. She dispatched her envoys several times to Okuninushi-no-kami, in order to negotiate the transfer of sovereignty over the land. Finally, he conceded sovereignty to Amaterasu Omikami. She summoned Ninigi-no-mikoto, her grandchild, and handed over to him the three imperial regalia that certify legitimacy to succeed the throne. she also gave him divine rice in heaven and ordered him to reign over the land of Ashihara-no-Nakatsukuni, guaranteeing everlasting prosperity for his dynasty and his throne. She made Ninigi-no-mikoto descend with other kami and their descendants, to the top of the mountain Takachiho-no-Mine in present Kyushu. There Ninigi-no-mikoto erected a palace and established the basis for the Japanese nation.
The third descendant of Ninigi-no-mikoto left Kyushu, and having overcome many difficulties with protection by Amaterasu Omikami arrived at Yamato, a region located almost at the center of the Japanese islands, in present Nara area. He established the capital at Kashihara and declared that he had founded the Japanese nation. In this way he became the first Emperor, taking the name Jinmu.