You can help expand this article with text translated from the corresponding article in Japanese. (November 2011) Click for important translation instructions. View a machine-translated version of the Japanese article. Machine translation, like DeepL or Google 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. Consider adding a topic to this template: there are already 3,684 articles in the main category, and specifying|topic= will aid in categorization. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content 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 the talk page. For more guidance, see Wikipedia:Translation.

Princess Yasuko or Princess Teishi (媞子内親王, Teishi (Yasuko) Naishinō; 1076–1096), later Ikuhomon'in (郁芳門院) was an honorary Empress of Japan to her brother Emperor Horikawa.

She was the first daughter of Emperor Shirakawa and Fujiwara no Kenshi (1057–1084), and the sister of Emperor Horikawa. She served as the Saiō 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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