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 was the 73rd emperor of Japan,Imperial Household Agency (''Kunaichō'') 堀河天皇 (73)/ref> according to the traditional List of emperors of Japan, order of succession. Horikawa's reign spanned the years from Heian period, 1087 through 1107 ...

Biography

She was the first daughter of

Emperor Shirakawa was the 72nd emperor of Japan,Imperial Household Agency (''Kunaichō'') 白河天皇 (72)/ref> according to the traditional order of succession. Shirakawa's reign lasted from 1073 to 1087. Genealogy Before his ascension to the Chrysanthemum T ...

and Fujiwara no Kenshi (1057–1084), and the sister of

. 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. Brian Douglas Ruppert,
Jewel in the Ashes: Buddha Relics and Power in Early Medieval Japan
' She retired as her brother's empress in 1093.

Notes

Japanese empresses consort 1076 births 1096 deaths Saiō Japanese Buddhist nuns 11th-century Buddhist nuns Daughters of Japanese emperors {{Japan-royal-stub