After the mid Heian period, the Fujiwara clan including the Northern House of the Fujiwara clan, was subdivided into the Kujo line, Ononomiya line, Kanin line and the like, and the Mido line which derived from the Kujo line established the status of Sekke (line of regents and advisers).
平安時代中期以後、藤原北家などの藤原氏一族が更に細分化され、九条流・小野宮流・閑院流などが成立し、やがて九条流から派生した御堂流が摂家としての地位を確立した。