It used to be considered that the octagonal burial mound was built as the mausoleum of the Emperor (such as the Emperor Tenchi, the Emperor Tenmu, and the Empress Jito) constructed after the mid-seventh century.
以前、八角墳は7世紀中頃以降の天皇陵の古墳（天智天皇、天武天皇、持統天皇など）として考えられていた。