You can helpexpand this article with text translated fromthe corresponding article in Japanese. (November 2011)Click [show] for important translation instructions. View a machine-translated version of the Japanese article. Machine translation, likeDeepL orGoogle Translate, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. Youmust providecopyright attribution in theedit summary accompanying your translation by providing aninterlanguage link to the source of your translation. A model attribution edit summary isContent in this edit is translated from the existing Japanese Wikipedia article at [[:ja:媞子内親王]]; see its history for attribution. You may also add the template{{Translated|ja|媞子内親王}} to thetalk page. For more guidance, seeWikipedia:Translation.

Princess Yasuko orPrincess Teishi (媞子内親王,Teishi (Yasuko) Naishinō; 1076–1096), laterIkuhomon'in (郁芳門院) was anhonorary Empress of Japan to her brotherEmperor Horikawa.

She was the first daughter ofEmperor Shirakawa andFujiwara no Kenshi (1057–1084), and the sister ofEmperor Horikawa. She served as theSaiō of her father Emperor Shirakawa in 1078–1086. In 1087, her father abdicated in favor of her brother Emperor Horikawa.

In 1091, she was appointed Honorary Empress to her twelve-year-old brother the Emperor. It was rare for a sister to be appointed Empress of her own brother, but she was actually his nurse and adoptive mother, their mother having been dead since he was five.^[1]

She retired as her brother's empress in 1093.

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