Since the era of Emperor Montoku, the Northern House of the Fujiwara clan became Regent and Chancellor as the Emperor's maternal relatives and the regency government was partly established, during the era of Emperor Daigo's child, brothers of the Emperor Suzaku and Emperor Murakami, this government was fully established.
文徳天皇の頃から藤原北家が天皇の外戚として摂政・関白につく摂関政治がある程度形成されていたが、醍醐の子である朱雀天皇・村上天皇兄弟の頃に、摂関政治が確立することとなる。