(古事記) is the oldest known historical book about ancient history of Japan
The book was presented by O no Yasumaro based on the works of Hieda no Are in 712 under the order of the Imperial Court. Nihonshoki followed the book.
In the Edo era, Motoori Norinaga studied Kojiki with publishing Kojiki-den.
The best English translation of Kojiki is by Donald L. Philippi from Columbia University Press, October 1982.