Emperor Jimmu

Emperor Jimmu (神武天皇, Jinmu Tennō; Japanese pronunciation: [dʑiꜜm.mɯ (ten.noː), dʑim.mɯ ten.noꜜː]) was the legendary first emperor of Japan according to the Nihon Shoki and Kojiki. His ascension is traditionally dated as 660 BC. In Japanese mythology, he was a descendant of the sun goddess Amaterasu, through her grandson Ninigi, as well as a descendant of the storm god Susanoo. He launched a military expedition from Hyūga near the Seto Inland Sea, captured Yamato, and established this as his center of power. In modern Japan, Emperor Jimmu's legendary ascension is marked as National Foundation Day on February 11.

There is little to no evidence to suggest that Jimmu existed; he is regarded by most modern scholars as a legendary figure.

Source: Wikipedia — https://en.wikipedia.org/wiki/Emperor_Jimmu