Yoritomo was subsequently was appointed to kenkan (powerful post, official) Chief of the Councilor of State, Ukone no daisho (the chief of Ukonoefu, the guarding section) and obtained the right to open a Mandokoro (Administrative Board), domestic governing institution of lords of the manor, with Kugyo (the top court officials), and thus came to have the legitimacy of governing system and furthermore Juei-ninen Jugatsu no Senji (the imperial decree issued to MINAMOTO no Yoritomo in October, 1183), the Bunji imperial sanction in 1185, and seii taishogun were declared.
そして権官大納言兼右近衛大将に叙任され、公卿に列し荘園領主の家政機関たる政所開設の権を得たことで、いわば統治機構としての合法性を帯びるようになり、さらに1183年の寿永二年十月宣旨、文治の勅許、征夷大将軍の宣下がなされた。