Taira no Tokiko

After the Heiji Rebellion, she became the wet nurse of Emperor Nijō's son, and on December 24, 1160, she was promoted to Jusanmi by the recommendation of Yaso no Tsubone.

After the death of Emperor Nijō, she and her half-sister Shigeko, who became a favored concubine of Go-Shirakawa, mediated the political alliance between Kiyomori and Go-Shirakawa, and when Prince Norihito (later Emperor Takakura) was appointed Crown Prince on October 10, 1166, she was promoted to Jūni-i on October 21 of the same year.

After the political upheaval of the Genpei War in 1180, when the grandson of Tokuko, Emperor Antoku, ascended the throne, she and Kiyomori were granted the title of Junsanmi.

Also, according to the "Azumakagami," Tokiko was said to have embraced Emperor Antoku and submerged herself while carrying both Ame no Murakumo no Tsurugi and another of the Three Sacred Treasures, the Yasakani no Magatama.

Additionally, in Hikiji, Nagato City, Yamaguchi Prefecture, there is a beach called "Nii-no-hama," named after the tradition that her body washed ashore there.