Viewing the Giseikan officer names during the early Heian period, the names of clans that had not existed during the Nara period, such as the Minamoto clan, the Tachibana clan, the Kiyohara clan, and the Sugawara clan, appeared suddenly, in addition of the name of the Fujiwara clan.
平安時代初期の議政官を見ると、藤原氏のほか、源氏、橘氏、清原氏、菅原氏などのように、奈良時代には見られなかった氏族が急速に台頭していた。