Saitō clan
Saitō Fuku was from the Saitō clan, a prominent samurai house that had served for generations as deputy military governors of Mino province. She was born in Kuroi Castle of Tanba province (comprising modern-day Hyogo and Kyoto Prefectures), which is where her father's territory was then located. Tanba Province was under the overlordship of Akechi Mitsuhide, and her father, Saitō Toshimitsu, as his retainer, was enfeoffed on that territory by Mitsuhide. Her mother's father was Inaba Yoshimichi.