However, around the beginning of the Heian period during the middle and latter period of the 9th century, the Northern House of the Fujiwara clan began to assume as Sessho (regency) and Kanpaku (chief adviser to the Emperor), which acted in place of the Emperor.
しかし、平安初期の9世紀中後期ごろから、藤原北家が天皇の行為を代理・代行する摂政・関白に就任するようになった。