The Yamauchi clan (山内氏) were a family of rulers over what was then the

Tosa Province was a province of Japan in the area of southern Shikoku. Nussbaum, Louis-Frédéric. (2005). "''Tosa''" in . Tosa bordered on Awa to the northeast, and Iyo to the northwest. Its abbreviated form name was . In terms of the Gokishichidō syste ...

which spanned the southern half of

Shikoku is the smallest of the four main islands of Japan. It is long and between wide. It has a population of 3.8 million (, 3.1%). It is south of Honshu and northeast of Kyushu. Shikoku's ancient names include ''Iyo-no-futana-shima'' (), '' ...

island. The province was given to the family in 1600 after

Yamauchi Kazutoyo , also spelled Yamanouchi (1545/1546? – November 1, 1605). He was retainer of Oda Nobunaga and later Toyotomi Hideyoshi. His father Yamauchi Moritoyo, was a descendant of Fujiwara no Hidesato, a senior retainer of the Iwakura Oda clan (op ...

led troops under

Tokugawa Ieyasu was the founder and first ''shōgun'' of the Tokugawa Shogunate of Japan, which ruled Japan from 1603 until the Meiji Restoration in 1868. He was one of the three "Great Unifiers" of Japan, along with his former lord Oda Nobunaga and fellow ...

at the

Battle of Sekigahara The Battle of Sekigahara (Shinjitai: ; Kyūjitai: , Hepburn romanization: ''Sekigahara no Tatakai'') was a decisive battle on October 21, 1600 (Keichō 5, 15th day of the 9th month) in what is now Gifu prefecture, Japan, at the end of ...

. The family stayed loyal to the Tokugawa dynasty until shortly before its overthrow in 1868. The head of the family at that time Yamauchi Toyoshige became prince of the newly formed

Kōchi Prefecture is a prefecture of Japan located on the island of Shikoku. Kōchi Prefecture has a population of 757,914 (1 December 2011) and has a geographic area of 7,103 km2 (2,742 sq mi). Kōchi Prefecture borders Ehime Prefecture to the northwest and ...

under Imperial rule.

Notable members

* Yamauchi Chiyo *

Yamauchi Toyoshige Yamauchi Toyoshige , also known as , was a Japanese '' daimyō'' in the Shikoku region in the late Edo period. Nussbaum, Louis-Frédéric. (2005)"Yamauchi Toyoshige"in ''Japan Encyclopedia'', p. 1045. He was usually referred to as “Lord Yōdō ...

References

Japanese clans Fujiwara clan {{Japan-hist-stub