Kochi Prefecture is a prefecture of Japan located on the south coast of Shikoku. The capital is the city of Kochi. Prior to the Meiji Restoration, Kochi was known as Tosa Province and was controlled by the Chosokabe clan in the Sengoku period and the Yamauchi family during the Edo period. Kochi City is also the birthplace of noted revolutionary Sakamoto Ryoma.