In "Shihon Taihei ki" (the Record of Great peace), Eiji YOSHIKAWA mentioned, 'It was common sense for emperors not to rule the government, instead, Chiten no kimi, the retired emperors and the cloister emperors who had joined a Buddhist order, took the actual control of the politics.
吉川英治は『私本太平記』中で「天子の座は象徴で、治天の君たる上皇、法皇にこそ実権がある、というのは既に常識であった。