The fall of the Hōjō resulted in a rehabilitation of the imperial power, which, however, as quickly relapsed under a new feudal rule. The story of this momentary success of the sovereign house must be prefaced by an account of its domestic affairs, which had caused its renewed uprising against the usurping regent at Kamakura. It will be remembered that, in 1221, the Hōjō exiled three ex-emperors and their partisans, who had raised their arms against the all-powerful feudal government. The influence of the Hōjō became so strong in Kyōto after this event that, when the Emperor Shijō died without heir, in 1242, the Regent Yasutoki succeeded, in spite of opposition, in raising his nominee on the throne as the Emperor Gosaga. This naturally further enhanced the power of the Hōjō. Gosaga abdicated in 1246, and was succeeded by his two sons, one after the other. Of these, the younger and abler, Emperor Kameyama, was the favorite of his retired father, and would have bequeathed the throne exclusively to his own descendants, had it not been for the intervention of the ex-emperor, who advocated the cause of the elder prince, the Emperor Gofukakusa. It was finally decided, during the regency of Hōjō Sadatoki, that the descendants of the two emperors--called, from the names of their respective residences, the Daikaku-ji and the Jimyō-in lines--should reign alternately, each for ten years. The Daikaku-ji line came first to the throne in the person of Gonijō (1301-1308), followed by Hanazono of the other line. The latter had to abdicate, in 1319, in favor of Godaigo of the first line. It was this last emperor who successfully, though for a brief period, restored the power of the imperial house, for, being like all other princes of his line, penurious and discontented, he was particularly offended at the conduct of the Kamakura regency, which not only kept him in straitened circumstances, but also alternated his house with the other and richer house favorable to the Hōjō. Godaigo perceived that, if he would insure his sovereignty, he must do away at the same time with the Hōjō rule and the system of alternate succession.