(On the other hand, since this period corresponds to so-called Kesshi-Hachidai [Eight Undocumented Sovereigns] to the era of the ninth Emperor, Kaika, some views persist that the credibility of the "Kojiki" and the "Nihonshoki" themselves is doubtful in the first place.)
（一方で、この時期は第9代開化天皇までのいわゆる欠史八代の期間にあたり、そもそも『古事記』『日本書紀』自体の信頼性を疑う見方も根強く存在する。）