Taira no Tokiko/Origin

Origin
Taira no Tokiko was the wife of Taira no Kiyomori, mother of Taira no Tokuko, as well as grandmother of Emperor Antoku. Buddhist name – Nii no Ama 二位尼. According to the Tale of the Heike, Taira no Tokiko drowned herself during the Battle of Dan-no-ura together with the boy-Emperor Antoku and the Sacred Sword, i.e., one of the Three Imperial Regalia of Japan.