The Gyoshi Taifu was also a new official position, which was later changed to Nagon (councilor), and was to transform the system of Kokusei sangi kan (government councilor) and Daibu (master), which had been under Daijin (minister) and Omuraji (military chief) since before the Taika Reform, into the new government-regulated system.
御史大夫は、新しい官名で、後の納言の前身で、大化前代以来、大臣・大連の下にあった国政参議官、大夫の制を官制化したもの。