Shimōsa Province
The Chiba clan (千葉氏 "Chiba-shi") was a branch family of the Kanmu Taira clan descended from Chiba Tsunetane, son of Taira no Tadatsune. The Chiba governed in Shimōsa Province, and the clan was based in present-day Chiba City. The clan additionally, for a period, the area that includes the Ise Grand Shrine. After the establishment of the Kamakura shogunate, the head of the Chiba clan became the hereditary shugo governor of Shimōsa Province.