She was the second daughter of Tsunenobu ISHII, the lord of Iimori-mura, Yoka no sho, Saga-gun, Hizen Province (present Kanoko, Honjo-machi, Saga City, Saga Prefecture).
肥前国佐嘉郡与賀庄飯盛村（現在の佐賀県佐賀市本庄町鹿子）の城主石井常延の次女。