During the tenth century, the regency of the Fujiwara clan (Fijiwara-Hokke, the Northern House of the Fujiwara clan) who had a strong matrimonial relationship with the Emperor, was established in the central position of decision making.
10世紀には貴族層の中でも天皇と強い姻戚関係を結んだ藤原氏（藤原北家）が政治意思決定の中心を占める摂関政治が成立した。