Chiba clan
The area of modern Ichihara is the center of ancient Kazusa province. The ruins of the Nara period Kazusa Kokubun-ji provincial temple have been found within the borders of Ichihara, although the exact location of the Nara-period provincial capital remains uncertain. During the Sengoku period, the area was contested between the Chiba clan to the north, and the Satomi clan to the south. During the Edo period, the area was divided between Goi Domain, Tsurumaki Domain and large areas of "tenryō" territory controlled directly by the Tokugawa shogunate and administered by various "hatamoto."