The Minamoto were followed by the Hōjō as feudal rulers. The Hōjō family was of Taira origin, its founder being Taira-no-Sadamori. The name Hōjō was derived from the fact that the family's headquarters were at Hōjō in Izu. During the period of Yoritomo's exile in Izu, he experienced generous and hospitable treatment at the hands of Hōjō Tokimasa, whose daughter he married. All during Yoritomo's campaigns and subsequent administration at Kamakura, Tokimasa, though of the Taira family, proved a loyal and indispensable counselor. Under Yoriije, being the grandfather on the mother's side, he naturally enjoyed the widest popularity and wielded the greatest power of all the military nobles of the time. As has been seen, the Hōjō did not even hesitate to assassinate the shōgun in order to further their personal interests. Tokimasa allowed himself to be controlled by the counsels of his wife. At her slanderous instance he brought about the overthrow of a great territorial noble, Hatakeyama, and by her advice he conceived the project of elevating to the shōgunate his younger daughter's husband, Hiraga Tomomasa. The third shōgun, Sanetomo, then a mere youth, was an inmate of Tokimasa's house at the time of this plot. His mother, Masako, learning what was on foot, caused him to be removed to the house of her brother Yoshitoki, with the assistance of the military vassals of the Minamoto, and succeeded not only in having Tokimasa and his intriguing wife sent back to Hōjō, but also in compassing the death of Tomomasa in Kyōto. These events transferred the territorial and military ascendancy among the Kamakura nobility to the Wada family, whom therefore Yoshitoki, the Hōjō chief in Kamakura, formed the design of destroying. In pursuance of that scheme, he prompted Kugyō to assassinate Sanetomo, the last of the Minamoto family. Then Fujiwara-no-Yoritsune, a relative of Yoritomo, was summoned from Kyōto to assume the nominal office of shōgun, Masako, the widow of Yoritomo, exercising the controlling power and Yoshitoki holding the office of regent (_shikken_, an office virtually corresponding with the _sesshō_ of the central government); in which capacity he administered all the affairs of the _bakufu_ in the name of the young shōgun. Yoshitoki was thus a _shōgun_ with the name of a _shikken_.