As for the origin of the Great King's family, there were several theories, such as having the lineage of Himiko of Yamataikoku (Yamatai Kingdom) in the Yayoi period as the King's ancestors, the dynasty of the King's ancestor was established in the fourth century, and onwards.
大王家の出自については、弥生時代の邪馬台国の卑弥呼の系統を大王家の祖先とする説、大王家祖先の王朝は4世紀に成立したとする説、など多くの説が提出されており定まっていない。