When MINAMOTO no Yoritomo established the Kamakura Government, the origin of the Kamakura bakufu, the lower-ranking government officials who were called on from Kyoto got its office job, and one of the Yuhitsu working there in the early period was OE no Hiromoto.
源頼朝が鎌倉幕府の原点である鎌倉政権を打ち立てた時に、京都から下級官人が招かれて事務的な業務を行ったが、初期において右筆を務めていたのが大江広元である。