When did jimmu tenno end his the empie?

Jimmu Tenno, the legendary first emperor of Japan, is said to have established the Japanese imperial line in 660 BCE, marking the beginning of the Japanese Empire. However, as a mythological figure, there is no historical record of his reign's end; traditional accounts suggest he ruled until around 585 BCE, but these dates are not definitively established in historical texts. Jimmu is often celebrated for his conquests and the establishment of Japan's foundations rather than a specific end to his empire.