Ninety years later, Taira-no-Tadatsune, vice-governor of the province of Kazusa, forcibly took possession of the provinces of Kazusa and Shimōsa, but was defeated by Minamoto-no-Yorinobu, a grandson of Tsunemoto. Soon afterward local chiefs raised an insurrection in the remote northern province of Mutsu, and maintained their authority for nine years. This was followed soon after by a three-year revolt of the Kiyowara family, which threw the provinces of Mutsu and Dewa into a state of tumult. These troubles were quelled, respectively, by Yoriyoshi, the son, and Yoshiiye, the grandson, of Yorinobu. Thus the influence of the Minamoto clan became paramount among the military men of the eastern provinces. All this while, courtiers and officials of Kyōto despised administrative duties, whether civil or military, so that in the event of a disturbance or of a feud among themselves, they were driven to rely upon the military classes, thus involuntarily but surely strengthening the influence of the men whom they professed to contemn. Although the Fujiwara remained in Kyōto and filled all the important posts in the general government, their sway was only apparent. The reins of state affairs were in reality held by the military classes dispersed throughout the provinces. There were also certain singular circumstances at court which not only hastened this revolution, but also brought the military forces from the provinces into a clash in the streets of Kyōto. These circumstances, which we shall briefly describe below, were in the main owing to two causes, namely, the undue wealth and power of the Buddhist priests, and the struggle for power among different political factions in the palace. The former was largely due to the devotion of the imperial house, particularly the Emperor Shirakawa (1073-1087), who greatly depleted the treasury by erecting thousands of temples and images, and ordering the performance of rites and the giving of alms with unprecedented profusion. The priests, who had already grown rich and powerful, began to be engaged in quarrels among themselves and with the outside world, for which purpose the greater monasteries maintained considerable military forces.