|Parent house||Fujiwara Hokke|
|Cadet branches||Ōshū Yamauchi|
The province was given to the family in 1600 after Yamauchi Kazutoyo led troops under Tokugawa Ieyasu at the Battle of Sekigahara. 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 under Imperial rule.
- Fogel, Joshua A. (2017). The Teleology of the Modern Nation-State: Japan and China. University of Pennsylvania Press. pp. 167–168. ISBN 9781512821611.
- Roberts, Luke S. (2002). Mercantilism in a Japanese Domain: The Merchant Origins of Economic Nationalism in 18th-Century Tosa. Cambridge University Press. p. 32. ISBN 9780521893350.