A struggle for succession in the mid-twelfth century gave the Fujiwara an opportunity to regain their former power. Fujiwara no Yorinaga sided with the retired emperor in a violent battle in 1158 against the heir apparent, who was supported by the Taira and Minamoto. In the end, the Fujiwara were destroyed, the old system of government supplanted, and the "insei" system left powerless as bushi took control of court affairs, marking a turning point in Japanese history. Within a year, the Taira and Minamoto clashed, and a twenty-year period of Taira ascendancy began. The Taira were seduced by court life and ignored problems in the provinces. Finally, Minamoto no Yoritomo (1147–99) rose from his headquarters at Kamakura (in the Kantō region, southwest of modern Tokyo) to defeat the Taira, and with them the child emperor Emperor Antoku they controlled, in the Genpei War (1180–85).