After the Taira clan was defeated in the Battle of Dan no ura on May 2, 1185, his father Tokitada was captured by the army of MINAMOTO no Yoshitsune and sent to Heian-kyo (the ancient capital of Japan in current Kyoto) as a captive.
寿永4年（1185年）3月24日の壇ノ浦の戦いで平家一門が滅亡すると、父時忠は源義経の軍勢に捕らえられて捕虜として平安京へ戻った。