According to the ancient Japanese chronicles Kojiki written in 680 and Nihon Shoki written in 720; Ojin was the son of the Emperor Chuai and his consort Jingu. As Chuai died before Ojin's birth; his mother Jingu became the de facto ruler. These sources allege that Ojin was conceived but unborn when Chuai died. His widow; Jingu; then spent three years in the conquest of Korea; then; after her return to Japan; the new emperor was born; three years after the death of the father.

Ojin became the crown prince at the age of four. He was crowned (in 270) at the age of 70 and reigned for 40 years until his death in 310. He supposedly lived in two palaces both of which are in present day Osaka. Ojin is traditionally identified as the father of Emperor Nintoku; who acceded after Ojin's death.

Ojin has been deified as Hachiman Daimyojin; regarded as the guardian of warriors. The Hata Clan considered him their guardian Kami. The actual site of Ojin's grave is not known; but he is traditionally venerated at a memorial Shinto shrine (misasagi) at Osaka.

The Imperial Household Agency designates this location as Ojin's mausoleum. It is formally named Eega no Mofushi no oka no misasagi. Pictures From History