The Kujo-ryu school refers to the descendants of the Northern House of the Fujiwara clan, especially, FUJIWARA no Morosuke and to the school of Yusoku kojitsu (court and samurai rules of ceremony and etiquette) handed down the FUJIWARA no Morosuke family.
九条流（くじょうりゅう）は、藤原北家の中でも藤原師輔の子孫を指す呼称及び同一族に伝えられた有職故実の流派を指す。