Under the insei system, as the 'chiten-no-kimi' was able to nominate his immediate and subsequent successors to the throne, a relatively stable Imperial succession was possible; moreover, it was possible to reflect the intention of the 'chiten-no-kimi' in the Imperial succession.
院政の下では、「治天の君」が次代・次々代の天皇を指名できたので、比較的安定した皇位継承が実現でき、皇位継承に「治天の君」の意向を反映させることも可能であった。