Princess Yoshiko (吉子女王, 28 October 1804 – 27 January 1893) was the younger sister of Prince Tsunahito of the Arisugawa-no-miya cadet branch of the Imperial House of Japan.

Yoshiko, the twelfth and youngest daughter of Prince Taruhito of the Arisugawa-no-miya family, was born of the union of her father and the courtesan Ando Kiyoko.

Princess Takako was said to have arranged the marriage, and Emperor Ninkō was recorded as having issued an approving comment on the political and educational pedigrees of the Mito branch of the Tokugawa clan.

[2] When Yoshiko moved to Edo and started leading the life of a samurai wife, she kept the attire of the imperial household for weeks after her marriage.

Widowed the next year, Yoshiko followed samurai custom and cut her hair short and made a pabbajja, retiring from social activities, and was renamed as Teiho-in (貞芳院).

Her stepson Akitake invited Yoshiko to live in his mansion at Koume, Tokyo, which was the shimo-yashiki, or the second official residence of the Mito clan in Edo.

[4] It took years for Yoshiko to overcome the prejudice among Meiji politicians as being anti-government, and for being the mother of Yoshinobu who had opened fire against the government supporters in Kyoto.

She offered condolences, arranging an extended family reunion of the children of Nariaki for the deceased, with Prince Taruhito as the guest of honor.