The "Nihonshoki" (Chronicles of Japan) and the "Kojiki" (The Records of Ancient Matters) were compiled around the early nineteenth century, from which it is assumed that the Yamato kingship was established in the end of the seventh century.
『日本書紀』、『古事記』は8世紀初頭頃に編纂されているので、ヤマト王権が確立したのは7世紀末であると推定される。