Princess Onna-ni (女二宮; personal name unknown) was a Japanese princess and daughter of Emperor Go-Mizunoo and his wife Tokugawa Masako.
Life Ninomiya was born on 14 October 1625 to Emperor Go-Mizunoo and Tokugawa Masako and was their second daughter.
According to the terms set out by the shōgunate upon the abdication of Ninomiya's half-sister, Empress Meishō, the princess, along with her half-brother (the soon-to-be Emperor Go-Kōmyō) were upon the few people that the Empress would actually be allowed to visit upon her abdication.
The princess wed Konoe Hisatsugu and together they had a daughter, Yoshi-miko. Their daughter wed the head of the Fushimi-no-miya, .
Furthermore, whilst not biologically related, Princess Ninomiya was considered the mother of Hisatsugu's son with a concubine, Konoe Motohiro.
She died in 1651 aged 25.
Regarding her name The princess's real name is unknown, with Onna Ninomiya being a title. Her name is sometimes written as Princess Akiko, however this is likely not her name, instead coming from her being mistakenly conflated for another daughter of Emperor Go-Mizunoo, .
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