Soga no Umako
Ten volumes in length, it covers the history of ancient Japan through Empress Suiko, third daughter of Emperor Kinmei. The preface is supposedly written by Soga no Umako (+626). While it includes many quotes from "Kojiki" (712) and "Nihon Shoki" (720), volumes five and ten contain unique materials. The overall composition is considered as having been compiled between 807 and 936.