Since MINAMOTO no Yoshitomo was defeated by TAIRA no Kiyomori at Heiji War in 1159, Kiyomori made an order that Yoshitomo's 14-year-old heir Yoritomo be banished to Izu Province.
源義朝が平治元年（1159年）の平治の乱で平清盛に敗れ、14歳の嫡男・頼朝も清盛によって伊豆国に流罪となる。