In addition, it is thought that "Teiki" (a genealogy of the Imperial Family) and "Kyuji" (a record of stories current at court) which were the basic historical materials for the compilation of Kojiki and the Nihonshoki were established around the seventh century.
なお、記紀編纂の基本史料となった『帝紀』、『旧辞』は7世紀頃の成立と考えられている。