Chiba clan
During the Heian period, the province was divided into numerous "shōen" controlled by local samurai clans, primarily the Chiba clan, which sided with Minamoto no Yoritomo in the Genpei War. During the Kamakura period, much of the province was under the control of the Ashikaga clan. By the early Muromachi period, the area was a highly contested region highly fragmented by various samurai clans. However, by the Sengoku period, the Satomi clan had gained control over much of Awa, Kazusa and Shimōsa provinces.