After the quelling of the Heiji disturbance, the Taira family attained preëminent prosperity and power. The fortunes of this great house had been materially advanced by Tadanori, a brave and able captain, who enjoyed the favor of the ex-Emperor Toba. His son Kiyomori, also a man of daring and decision, raised the family's prestige still higher by his services at the Hōgen crisis, and carried it to its zenith by the conspicuous ability of his action in the Heiji disturbance. On the other hand, the rival family of Minamoto having been reduced to insignificance by the death of its chief, Yoshitomo, and by the events that immediately ensued, the whole military power of the empire came into the hands of the Taira. Kiyomori was promoted to the position of _gondainagon_ (vice-councilor of state), an event that attracted much attention. The Taira family, though of imperial lineage, had been looked down upon by the high court nobles on account of its military career, and it was considered a notable occurrence that Kiyomori should have been nominated to a post of such consequence. This was, in truth, the first instance of a military noble's participation in the administration of state affairs, and it may be regarded as the dawn of an era when they were to fall entirely under military control. A sister of Kiyomori's wife bore a son to the ex-Emperor Goshirakawa. Kiyomori's favor at court was so great that he succeeded in getting this child named heir apparent, and he ultimately ascended the throne in 1169 as the Emperor Takakura. Throughout his reign the ex-Emperor Goshirakawa was the actual ruler. Meanwhile, Kiyomori had steadily risen in imperial favor, until in 1167 he became chief minister of state. Shortly afterward, however, he resigned that post, and taking the tonsure, became a priest under the name of Jōkai. None the less he remained at his previous place of residence, Rokuhara, in Kyōto attending to the management of state affairs as before. From that time dates the custom subsequently followed by the military class of making Rokuhara the seat of administration.