After transferring of the national capital to Heijo, udaijin (minister of the right) FUJIWARA no Fuhito played a main role in the political world, and the pro-imperial force, such as Imperial Prince Toneri and Prince Nagaya, rivaled him.
平城京遷都後、右大臣藤原不比等が政界の中心となり、舎人親王や長屋王ら皇親勢力がこれに対する形であった。