So politically stable periods succeeded from the reign of Emperor Saga to the reign of Emperor Ninmyo that they were adored as Subun no chi (the peaceful era of Subun), however, the Emperor Saga did not quickly abdicate the thrown in favor of his son, Imperial Prince Masara (Emperor Ninmyo) while he abdicated the thrown in favor of a younger brother of the prince, Imperial Prince Otomo (Emperor Junna) and this incident produced a faction on the side of each prince.
嵯峨朝から仁明朝は崇文の治と称えられるほどの安定した治世ではあったが、嵯峨天皇がすぐに皇子である正良親王(仁明天皇)に譲位せず、弟の大伴親王(淳和天皇)に譲位した事は両親王派の派閥を生む事となった。