Niwa clan
The area of present-day Nihonmatsu was part of ancient Mutsu Province. It developed as post station on the Ōshū Kaidō highway and as the castle town of Nihonmatsu Domain, a 100,700 "koku" han, which was ruled by the Niwa clan under the Tokugawa shogunate) in the Edo period. After the Meiji Restoration, it was organized as part of Adachi District in the Nakadōri region of Iwaki Province.