However as time went by, new clans including the Minamoto clan, the Tachibana clan, the Kiyohara clan, the Sugawara clan as well as the Fujiwara clan who established a deep matrimonial relation with the Emperor, started to rapidly occupy the upper noble class.
しかし時代が進むにつれ、天皇と濃密な姻戚関係を結んだ藤原氏一族のほか、源氏、橘氏、清原氏、菅原氏といった新興氏族が急速に上流貴族階層を占めていった。