Until now a study on politics process of the ruling class in middle Silla period has focused on the conflict between king and novel class. But I have emphasized on the welfare and peace for state.
In this point of view, what Sa Ryun(舍輪), the second son of King Jin Hung(眞興王) took the throne is due to King Jin Hung’s help. In addition, Sa Ryun had a legitimacy of succession to the throne. And Geo Chill Boo(居柒夫) who controlled politics on King Jin Ji(眞智王) era was a favorite retainer of King Jin Hung. So he could work as a assistance of King Jin Ji. Despite of Sang dae dung(上大等) Geo Chill Boo’s help, King Jin Ji who was lack of political ability was dethroned by the noble(國人) because of incompetency and lewdness(政亂荒淫).
After the dethrone of King Jin Ji, Baek Jeong(白淨), grandson of King Jin Jj acceded to the throne as King Jin Pyeong(眞平王). This work has understood as a challenge of royal authority. But this work can be understood as achievement of anti-King Jin Ji powers for the public peace. So in spite of young King Jin Pyeong’s throne, King Jin Pyeong could reinforce his power and build new government office on the basis of his supporters. The study on the development of politics need approach of the various viewpoint in middle Silla period. Through this study, we can understand this period.