Nobutomo BAN who lived in the Edo period presumed that the remote cause of the dissatisfaction between Emperor Tenchi and Emperor Tenmu was a dispute over Nukata no Okimi (woman) as in the contents of waka (Japanese poetry) written by Nukata no Okimi in the "Manyoshu" (anthology of Japanese poems).
江戸時代の伴信友は『万葉集』に収録されている額田王（女性）の和歌の内容から、額田王をめぐる争いが天智・天武間の不和の遠因ではないかと推測している。