| When Insei that the Retired Emperor reigned as Chiten no kimi, a factual monarch, and performed government affairs started in the late Heian period, In no cho changed to an important political institution to express and embody Chiten's political wills. |
平安後期に、上皇が治天の君（事実上の君主）として君臨し、政務にあたる院政が開始すると、院庁は、治天の政治意思を表明・具現化するための重要な政務機関へと変貌した。 |