Emperor Antoku
In 1171, Kiyomori arranged a marriage between Emperor Takakura and his daughter Tokuko. Their first son, the future Emperor Antoku, was born in 1178. The next year, in 1179, Kiyomori staged a coup d'état forcing the resignation of his rivals from all government posts and subsequently banishing them. He then filled the open government positions with his allies and relatives, and imprisoned the cloistered Emperor Go-Shirakawa. Finally, in 1180 Kiyomori forced Emperor Takakura to abdicate and give Prince Tokihito the throne, who then became Emperor Antoku.