Those mythologies were made earlier, during the early Heian period, or were revised by Norinaga MOTOORI, a scholar of Japanese classical literature in Ise Province such as Hidehiro OKADA.
より時代の下る平安時代初期ころの創作、あるいは岡田英弘のように伊勢国の国学者本居宣長によって改作されたものであるとする。