During the Middle Ages, the so-called Medieval Mythology (Chusei Nihongi) developed, including military epics such as "Taiheiki" (The Record of the Great Peace), Kagakusho (books on the study of waka poems) and commentaries on them, as well as the origins of temples and shrines, which were based on "Nihon Shoki" (Chronicles of Japan) yet differ greatly in content.
中世に入ると、『太平記』などの軍記物、歌学書やその注釈、寺社縁起などにおいて『日本書紀』にもとづきながらその内容に大きな差異が認められる、いわゆる中世神話（中世日本紀）が発達した。