The Tosa Domain (土佐藩, Tosa-han) was a domain of the Tokugawa Shogunate of Japan during the Edo period from 1601 to 1871.

Kōchi Domain

Tosa Domain
Domain of Japan
Kochi Castle08s3872.jpg
Kōchi Castle in Kōchi
Flag of Tosa Domain
Flag [a]
Mon of the Yamauchi of Tosa Domain
Mon of the Yamauchi
CapitalKōchi Castle
 • Coordinates36°33′52″N 136°39′33″E / 36.564317°N 136.659228°E / 36.564317; 136.659228
• 1601-1605
Yamauchi Kazutoyo (first)
• 1859-1871
Yamauchi Toyonori (last)
Historical eraEdo period
• Established
Contained within
 • ProvinceTosa
Today part ofKōchi Prefecture

The Tosa Domain was based at Kōchi Castle in Tosa Province, in the modern city of Kōchi, located on the island of Shikoku. The Tosa Domain was ruled for its existence by the tozama daimyō of the Yamauchi and its territory covered Tosa Province. Many people from the domain played important roles in events of the late Edo period including Nakahama Manjirō, Sakamoto Ryōma, Yui Mitsue, Gotō Shōjirō, Itagaki Taisuke, Nakae Chōmin, and Takechi Hanpeita. The Tosa Domain was renamed the Kōchi Domain (高知藩, Kōchi-han) during the early Meiji period until it was dissolved in the abolition of the han system in 1871 and became Kōchi Prefecture.

Tosa Jinshotai (迅衝隊) soldiers with Shaguma headress in the Battle of Ueno, Boshin War (1867–68)
Jinshotai(迅衝隊)(From the left in the bottom row: Ban Gondayu, Itagaki Taisuke, Tani Otoi(young boy), Yamaji Motoharu. From the left in the middle row: Tani Shigeki(Sinbei), Tani Tateki(Moribe), Yamada Kiyokado(Heizaemon), Yoshimoto Sukekatsu(Heinosuke). From the left in the top row: Kataoka Masumitsu(Kenkichi), Manabe Masayoshi(Kaisaku), Nishiyama Sakae, Kitamura Shigeyori(Chobei), Beppu Hikokuro.)


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

By the 16th century, Tosa Province was a base of the Chōsokabe clan, which briefly controlled the entire island of Shikoku under Chōsokabe Motochika from 1583 until he was defeated by Toyotomi Hideyoshi in the Invasion of Shikoku in 1585. Motochika fought for Hideyoshi in the Kyushu Campaign and the invasions of Korea. The next daimyō Chōsokabe Morichika joined the pro-Toyotomi Western Army at the Battle of Sekigahara in 1600, and was subsequently removed from Tosa by the victorious Tokugawa Ieyasu, who granted the domain to Yamauchi Kazutoyo.[1] The Chōsokabe's retainers were mutinous, while Tosa peasants feared increased exploitation under the new lord and many fled across to the neighboring domains. Kazutoyo came in with only 158 mounted men, and had to petition the new government of the Tokugawa shogunate for help in pacifying his new domain. This was achieved by "ruse and violence ... Two boatloads containing 273 heads were sent to Tokugawa headquarters to demonstrate Yamauchi efficiency, and another 73 dissidents were crucified on the beach."[1]

List of daimyōsEdit

  1. Kazutoyo
  2. Tadayoshi
  3. Tadatoyo
  4. Toyomasa
  5. Toyofusa
  6. Toyotaka
  7. Toyotsune
  8. Toyonobu
  9. Toyochika
  10. Toyokazu
  11. Toyo'oki
  12. Toyosuke
  13. Toyoteru
  14. Toyoatsu
  15. Toyoshige
  16. Toyonori

Simplified genealogy of the Yamauchi daimyōs of TosaEdit

  • Yamauchi Moritoyo (1510 – c. 1559)
    •   I. Kazutoyo, 1st daimyō of Tosa (cr. 1601) (c. 1545 – 1605; r. 1601–1605)
    • Yasutoyo (1549-1625)
      •   II. Tadayoshi, 2nd daimyō of Tosa (1592–1665; r. 1605–1656)
        •   III. Tadatoyo, 3rd daimyō of Tosa (1609–1669; r. 1656–1669)
          •   IV. Toyomasa, 4th daimyō of Tosa (1641–1700; r. 1669–1700).
      • Fukao Shigemasa (1598–1672). Adopted into the Fukao family
        • Fukao Shigeteru
          • Fukao Shigenao
            • Yamauchi Tadashige (1682–1721)
              •   VIII. Toyonobu, 8th daimyō of Tosa (1712–1768; r. 1725–1767)
                •   IX. Toyochika, 9th daimyō of Tosa (1750–1789; r. 1768–1789)
                  •   X. Toyokazu, 10th daimyō of Tosa (1773–1825; r. 1789–1808)
                    •   XI. Toyoaki, 11th daimyō of Tosa (1793–1809; r. 1808–1809).
                    •   XII. Toyosuke, 12th daimyō of Tosa (1794–1872; r. 1809–1843)
                      •   XIII. Toyoteru, 13th daimyō of Tosa (1815–1848; r. 1843–1848)
                      •   XIV. Toyoatsu, 14th daimyō of Tosa (1824–1848; r. 1848)
                      •   XVI. Toyonori, 16th daimyō, 16th family head, 1st Marquess (1846–1886; r. 1859–1869; Governor of Tosa 1869–1871; Marquess: 1884)
                        • XVII. Toyokage, 2nd Marquess, 17th family head (1875–1957; 2nd Marquess 1886–1947; 17th family head 1886–1957)
                        • Toyoshizu, 1st Baron Yamauchi (cr. 1906) (1883–1937)
                          • XVIII. Toyoaki, 18th family head (1912–2003; 18th family head 1957–2003)
                            • XIX. Toyokoto, 19th family head (b. 1940; 19th family head 2003– )
                              • Toyohiro (b. 1978)
                              • Toyonao (b. 1979)
                    • Toyoakira (1802–1859)
                      •   XV. Toyoshige, 15th Lord of Tosa (1827–1872; r. 1849–1859)
      • Kazutada (1600–1663)
        • Kazutoshi (1649–1675)
          •   V.Toyofusa, 5th daimyō of Tosa (1672–1706; r. 1700–1706)
          •   VI. Toyotaka, 6th daimyō of Tosa (1673–1720; r. 1706–1720)
            •   VII. Toyotsune, 7th daimyō of Tosa (1711–1725; r. 1720–1725).


See alsoEdit


  1. ^ Flag used by the Tosa army during the Boshin War from 1868 to 1869.


  1. ^ a b M. B. Jensen, The making of modern Japan, (Harvard University Press, 2002), pp. 51–52
  2. ^ Yamachi genealogy