Tosa Domain

The Tosa Domain (土佐藩, Tosa han^?) was a feudal domain in Tosa Province of Japan (present-day Kōchi Prefecture) during the Edo period. Its official name is "Kōchi han" (高知藩^?). Some from the domain played important roles in events in the late Tokugawa shogunate. Among them are Nakahama Manjirō, Sakamoto Ryōma, Yui Mitsue, Gotō Shōjirō, Itagaki Taisuke, Nakae Chōmin.

Around 1400 Tosa was controlled by Hosokawa clan, associates of the Ashikaga shoguns.

In 16th century Tosa was a base of the Chōsokabe clan, that under briefly (1583-1585) controlled the entire island of Shikoku. Defeated by Toyotomi Hideyoshi in 1585, Chōsokabe fought for him in Kyushu and Korea. The next daimyo Chōsokabe Morichika joined the western host at Sekigahara. He was removed from the province by a victorious Tokugawa Ieyasu, who granted the domain to Yamauchi Kazutoyo in 1600.

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