
Kochi Prefecture — A History Portal
Mocked as “the domain farthest from Edo,” Tosa nonetheless produced, in close succession, the man whose ideas drove the Meiji Restoration, the epicenter of the Freedom and People's Rights Movement, and the founder of one of Japan's largest business empires. Behind it all: a rigid caste system that kept the losers and winners of Sekigahara living side by side, a Pacific-facing coastline that turned people's eyes outward, and a pilgrimage culture built on welcoming strangers along 24 of Shikoku's 88 sacred temples. This is the “why” of Tosa that never makes it into a tourist brochure.
Four keys to Tosa
Satsuma and Choshu were not the only domains to produce leaders of the Meiji Restoration — yet Tosa's history reads differently, and for good reason. First: an unusually rigid, centuries-long caste split between “goshi” (rural samurai descended from the defeated Chosokabe retainers) and “joshi” (the upper samurai who arrived with the victorious Yamauchi clan). Second: the restless energy of people like Ryoma, born a goshi, or Itagaki Taisuke, born into a lower samurai family, who pushed change precisely because they stood outside the existing order. Third: an outward-facing instinct nurtured by the open Pacific — the same instinct that produced John Manjiro and Iwasaki Yataro. And fourth: a land generous enough to have hosted, for over a thousand years, pilgrims walking 24 of Shikoku's 88 sacred temples. This site is organized around these four threads.
Explore the site
Each page stands alone — start wherever interests you.
The defeated Chosokabe clan, the victorious Yamauchi. Two centuries of caste conflict begin.
Read →Ryoma, Nakaoka Shintaro, Lord Yamauchi Yodo — a low-ranking retainer and his own lord, moving history together.
Read →A 27-year-old who staked his life to leave. What was he looking for beyond the border?
Read →The son of a landless ronin, Iwasaki Yataro, built Mitsubishi from nothing.
Read →John Manjiro, Nakae Chomin, Makino Tomitaro — a lineage of restless minds.
Read →One of Japan's 12 original castle keeps — the only one where the whole residence survives too.
Read →Known as the “place of ascetic practice.” Why 24 of the 88 temples are in this one prefecture.
Read →“Freedom springs from the mountains of Tosa.” The seeds Itagaki Taisuke planted.
Read →Seared bonito, feast-sized sara-bachi platters, yuzu — the richness the Kuroshio Current brings.
Read →From Katsurahama to the Shimanto River and Ryuga Cave — a collection of Tosa's landmarks.
Read →“Let us wash Japan clean, once and for all.” The real Ryoma, as his letters show him.
Read →Ten books, from Shiba Ryotaro's novel to recent scholarly biographies, to go deeper into Tosa.
Read →In pictures
Some things are easier shown than told. Each card links to the page it belongs to.
Overview
The full stories live on their own pages — here's just the arc.
Chosokabe Morichika, who sided with the losing western army, forfeits the whole of Tosa. The following year, Yamauchi Katsutoyo arrives as its new lord.
Former Chosokabe retainers are reclassified as low-ranking "goshi," creating a gap with Yamauchi's own "joshi" retainers that lasts until the Meiji era.
His family, wealthy merchants by trade, held low rank but real means — a common pattern among Tosa's goshi households.
The 27-year-old Ryoma leaves Tosa without permission, studies under Katsu Kaishu, and founds what's often called Japan's first trading company, the Kameyama Company, in Nagasaki.
Shortly after the shogunate's power is formally returned to the Emperor, Ryoma is assassinated alongside Nakaoka Shintaro at the Omiya inn in Kyoto.
His petition for a national assembly, and the words "though Itagaki dies, liberty never will," make Tosa a stronghold of the movement.