After the late eleventh century, the predecessors of the Emperor clan took control of the Emperor clan as a Retired Emperor or a Cloistered Emperor, and were called Chiten no kimi (the retired emperor in power), and held the cloister government by seizing political power.
11世紀後半以降、天皇家の家督者は上皇・院という立場で天皇家を支配し、治天の君と呼ばれ政治の実権を握って院政を展開した。