For example, Emperor Shirakawa in the Heian period handed over his throne to his son, Emperor Horikawa, he became Daijo Tenno (the retired Emperor) and held the real political power until 1129 when he died.
たとえば平安時代の白河天皇は、皇子の堀河天皇に皇位を譲って太上天皇となったが、1129年に崩御するまでは政治の実権を掌握していた。