Kujiki (旧事紀, Kujiki^?), or Sendai Kuji Hongi (先代旧事本紀, Sendai Kuji Hongi^?), is an ancient Japanese historical text. Ten volumes in length, it covers the history of ancient Japan through Empress Suiko. 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 generally regarded as an early Heian 10th century work. However, there are theories that it is a copy of an earlier seventh century text mentioned in the Kojiki. Its authenticity is unresolved, and it has not yet been translated into English. Empress Suiko (推古天皇 Suiko Tennō) (554-April 15, 628[1]) was the 33rd emperor of Japan, according to the traditional order of succession, and the first known woman to hold this position. ... Soga no Umako (蘇我馬子; 551? - 20 May 626), the son of Soga no Iname and the strongest member of Soga clan of Japan, conducted politicial reforms with Prince Shotoku during the rules of Emperors Bidatsu and Suiko, and established Soga clans stronghold in the governemt by having his daughter married... Kojiki or Furukotofumi (古事記), also known in English as the Records of Ancient Matters, is the oldest surviving historical book recounting events of ancient earth in the Japanese language. ... Nihonshoki (日本書紀) is the second oldest history book about the ancient history of Japan. ...

Further reading

• John R. Bentley. The Authenticity of Sendai Kuji Hongi: A New Examination of Texts, With a Translation And Commentary. ISBN 90-04-15225-3