In Nihon Shoki, Book XIV, under Emperor Yūryaku year 7 (purportedly 463 A.D.), it is recorded that the emperor expressed the desire to get a glimpse of the deity of Mount Mimoro (Mount Miwa) and ordered a man known for his brute strength, named to go capture it. (A scholium in the codices writes the identity of the god of this mountain is said to by by some sources, and ). Sugaru thereby climbed the mountain and captured and presented it to the emperor. But Yūryaku neglected to purify himself (by religious fasting, etc.) so that the great serpent made thunderous noise and made its eyes glare. The frightened emperor retreated to the palace, and had the snake released in the hill. He gave the hill a new name, Ikazuchi (lit. thunderbolt).