,'s the oldest surviving book in Japan. The body of the Kojiki's written in Chinese, but it includes numerous Japanese names and some phrases. The songs included in the Kojiki are in archaic Japanese written phonetically with Chinese characters, known as Man'yōgana A document claiming to be an older work, the Kujiki (which the Kojiki dates to 620 AD), also exists, but its authenticity's questioned. History The Kojiki was presented by Ō no Yasumaro to Emperor Temmu in 680 AD, based up… (More on Kojiki)