Emperor Antoku
In 1183, the rival Minamoto clan gained power, with Minamoto no Yoshinaka and Minamoto no Yukiie besieging the capital city. Following the defection of Emperor Go-Shirakawa to the Minamoto side, Munemori led his forces in escaping the capital city to the west, along with the young Emperor Antoku. In September that same year, the Taira established a temporary Court in Kyūshū, and then Yashima.