In March 1185 the Taira clan lost the Battle of Danno ura against Yoshitsune, Tokuko's mother, Niino ama, drowned herself together with Emperor Antoku and carried the three sacred emblems of the Imperial Family with them to their deaths.
そして、元暦2年/文治元年（1185年）3月、壇ノ浦の戦いで平家は義経に敗れ、母の二位尼は三種の神器を携え、安徳天皇とともに入水した。