The Legend of Jimmu

At a Glance

Central figures: Jimmu (born Iwarebiko), great-great-grandson of the sun goddess Amaterasu and first emperor of Japan; and his divine ancestors Ninigi-no-Mikoto, Hikohohodemi, and Ugaya Fukiaezu, who form the chain of descent from the heavens.
Setting: Kyushu and the Yamato region of central Honshu; the deep mythological past before Japan’s historical record begins, rooted in Shinto tradition.
The turn: Realizing his forces were fighting with the sun in their eyes, Jimmu reversed his line of march and approached Yamato from the west - fighting with the sun at his back, as a descendant of Amaterasu should.
The outcome: Jimmu defeated the clans of Yamato, established his capital at Kashihara, and was recognized as the first Tenno - Heavenly Sovereign - of Japan, founding an imperial line said to continue unbroken to the present day.
The legacy: The Three Sacred Treasures - the mirror, the jewel, and the sword - passed from Amaterasu down through Jimmu’s line, are presented at every imperial coronation; and National Foundation Day is held on February 11th to commemorate the founding of the nation.

Jimmu was not the beginning. He was several generations deep into a line that started in the heavens, and that weight of descent was the whole point. His great-grandfather Ninigi-no-Mikoto had come down from Takamagahara - the celestial realm - carrying three objects: a bronze mirror called the Yata no Kagami, a curved jewel called the Yasakani no Magatama, and a sword called the Kusanagi no Tsurugi. These were not gifts. They were the authority of Amaterasu herself, made tangible, handed down the line. Ninigi’s son Hikohohodemi married the daughter of the Dragon God of the Sea. Their child was Ugaya Fukiaezu. Ugaya Fukiaezu’s son was the boy who would become Emperor Jimmu - born in Kyushu, at the southern edge of the islands, with the entire length of Japan stretching away to the northeast and the sun goddess somewhere above all of it.

The Descent from Takamagahara

Amaterasu’s decision to send Ninigi down from the celestial realm was the act that set everything in motion. The earth needed order, and the line of descent needed to take root in the land itself. Ninigi brought the Three Sacred Treasures not as ornaments but as instruments of rule - the mirror reflecting divine truth, the jewel signifying imperial virtue, the sword the force to protect the people. When Hikohohodemi married into the lineage of the Dragon God of the Sea, he drew the ocean itself into the bloodline. The child born of that marriage, Ugaya Fukiaezu, carried both the light of the sun kami and the depth of the sea. From him came Iwarebiko - who would be Jimmu.

By the time Jimmu was born, his line had already accumulated divine weight on two axes: the heavens through Amaterasu, the waters through the Dragon God. The earth was the only element not yet claimed. That would come with conquest.

The Road Eastward from Kyushu

Jimmu knew Kyushu was not his destination. The richer, more central lands of Yamato - in what is now the Nara region of Honshu - were where the unification would have to happen. He set out eastward with his brothers, moving through territory held by tribal clans who had no interest in yielding to a young man from the southern island, divine lineage or not.

The early stages of the campaign were hard. The clans of Yamato were established, their leaders powerful, and the terrain did not favor an eastern approach. Jimmu’s forces pushed inland but the fighting went badly. The problem, as Jimmu came to see it, was not merely tactical. A descendant of the sun goddess was advancing toward the sunrise - which meant he was fighting directly into the light of his own divine ancestor. The sun was in his soldiers’ eyes. There was something wrong in the order of things.

Turning to Follow the Sun

Jimmu stopped. He reversed the direction of his march and swung his forces around to approach Yamato from the west instead, so that when his army faced the enemy, the sun rode at their backs.

It worked. The shift was decisive. Whether the advantage was spiritual, psychological, or simply that an army fighting with the sun behind it sees more clearly than one squinting into the east, the result was the same: Jimmu’s forces broke through the resistance in Yamato. The clans fell. The central region of Honshu opened.

There is something clean about this moment in the story. Jimmu did not receive a divine weapon or a miraculous intervention. He noticed a mistake and corrected it. He recognized that his nature as a descendant of Amaterasu had a directional logic, and he oriented himself accordingly. The kami did not move the sun for him. He moved himself.

Kashihara and the First Throne

After the conquest of Yamato, Jimmu built his capital at Kashihara, at the foot of Mount Unebi. He established what tradition marks as the first imperial dynasty of Japan, and the date given - though mythological in character - is 660 BCE. He took the title Tenno, Heavenly Sovereign, and with that title came the full weight of everything that had descended from Takamagahara: the authority of Amaterasu, the sacred objects, the obligation to maintain the connection between the people, the land, and the divine order above both.

His rule, as described, was not characterized by further war. The conquest was the necessary passage. What came after was governance - the establishment of centralized authority, the promotion of what later tradition would call wa, harmony between the human and the divine, between the governed and those who governed. Jimmu was the bridge, and once the bridge was in place, the crossing could begin in both directions.

The Three Sacred Treasures were kept and passed on. The mirror, the jewel, the sword - not displayed as trophies but preserved as living symbols, housed at major Shinto shrines, brought out at coronations. Each new Tenno received them and with them received the claim: we are of that line, and the line has not broken.

Kashihara Shrine and the Continuing Line

Jimmu died, as the tradition tells it, but the line continued. Emperor after emperor carried the unbroken succession down through the centuries - mythological reign giving way to the dimly historical, the dimly historical to the fully documented, and the documented to the present. The Kashihara Shrine in Nara stands at the site of Jimmu’s capital, and people still come there - not only pilgrims in a religious sense but anyone drawn to stand at the point where the story says it began.

On February 11th, Japan observes Kenkoku Kinen no Hi - National Foundation Day - marking the date traditionally assigned to Jimmu’s accession. It is not a lavish festival. It is a quiet acknowledgment that the nation’s founding story runs through a man who turned around on a road in Yamato because he understood which way the sun was supposed to stand.

The Sacred Treasures remain. The title Tenno remains. The line, by the count of the tradition, has never been severed - stretching from Amaterasu’s decision to send Ninigi down from the heavens, through the Dragon God’s daughter, through Ugaya Fukiaezu, to a boy born in Kyushu who looked east and then chose west.