This age was the age of MINAMOTO no Sanetomo, but his mother Masako HOJO held real power, and this resembles the relationship between the emperor and Insei (rule by the retired Emperor) in the imperial court.
この時代は源実朝の時代であるが、実権はその母の北条政子にあり、ちょうど朝廷における天皇と院政の関係にも似ている。