Tosa Domain in the context of "Takechi Hanpeita"

The Boshin War (戊辰戦争, Boshin Sensō), sometimes known as the Japanese Revolution or Japanese Civil War, was a civil war in Japan fought from 1868 to 1869 between forces of the ruling Tokugawa shogunate and a coalition seeking to seize political power in the name of the Imperial Court.

The war stemmed from dissatisfaction among many nobles and young samurai with the shogunate's handling of foreigners following the opening of Japan during the prior decade. Increasing Western influence in the economy led to a decline similar to that of other Asian countries at the time. An alliance of western samurai, particularly the domains of Chōshū, Satsuma, and Tosa, and court officials secured control of the Imperial Court and influenced the young Emperor Meiji. Tokugawa Yoshinobu, the sitting shōgun, realizing the futility of his situation, abdicated and handed over political power to the emperor. Yoshinobu had hoped that by doing this the House of Tokugawa could be preserved and participate in the future government.

Shishi (志士), sometimes known as Ishin Shishi (維新志士), were a group of Japanese political activists of the late Edo period. While it is usually applied to the anti-shogunate, pro-sonnō jōi (尊皇攘夷; lit. 'Revere the Emperor, Expel the Barbarian[s]') samurai primarily from the southwestern clans of Satsuma, Chōshū, and Tosa, the term shishi is also used by some with reference to supporters of the shogunate, such as the Shinsengumi.

There were many different varieties of shishi. Some, such as the assassins Kawakami Gensai, Nakamura Hanjirō, Okada Izō, and Tanaka Shinbei, opted for a more violent approach in asserting their views. Kawakami Gensai, in particular, is recalled as the assassin of Sakuma Shōzan, a renowned pro-Western thinker of the time. Several assaults on westerners in Japan have been attributed to the shishi and associated rōnin warriors. In a 2013 article, these assassins have been called "early terrorists" (German: frühe Terroristen) since they opted to spread terror among the foreigners. Other more radical shishi, such as Miyabe Teizō, plotted large-scale attacks with little regard for public safety. Miyabe himself was one of the ringleaders of the plot, foiled by the Shinsengumi at the Ikedaya Incident, to burn Kyoto at the height of the Gion Festival.

The Battle of Toba–Fushimi (鳥羽・伏見の戦い, Toba-Fushimi no Tatakai) occurred between pro-Imperial and Tokugawa shogunate forces during the Boshin War in Japan. The battle started on 27 January 1868 (or fourth year of Keiō, first month, 3rd day, according to the lunar calendar), when the forces of the shogunate and the allied forces of Chōshū, Satsuma and Tosa Domains clashed near Fushimi, a town near Kyoto, the sacred capital, and fighting progressed to the Toba road leading to Osaka, with the initial rout of the Satsuma from Fushimi. The battle lasted for four days, ending in a decisive defeat for the shogunate.

Count Itagaki Taisuke (板垣 退助, 21 May 1837 – 16 July 1919) was a Japanese samurai, politician, and leader of the Freedom and People's Rights Movement (自由民権運動, Jiyū Minken Undō), which evolved into Japan's first political party, the Liberal Party (Jiyūtō). His activism in favour of a parliamentary democracy was a pivotal influence on the political development of Meiji Japan.

A native of Tosa Domain, Itagaki was a leading figure in the Meiji Restoration and held a series of posts in the new government, including that of Councillor of State (参議, sangi). In 1873, he resigned from government after his proposal for a military expedition to Korea, a policy known as Seikanron, was rejected by the ruling oligarchy. After his resignation, Itagaki formed the Aikoku Kōtō (Public Party of Patriots), Japan's first political association, and launched a political movement aimed at establishing a representative assembly. He submitted a memorial to the government in 1874 calling for the creation of a national assembly, which, though initially dismissed, sparked a nationwide debate and is considered the foundational event of the Freedom and People's Rights Movement.

The Ikedaya incident (池田屋事件, Ikedaya jiken), also known as the Ikedaya affair or Ikedaya riot, was an armed encounter between the shishi which included masterless samurai (rōnin) formally employed by the Chōshū, Tosa and Higo domains (han), and the Shinsengumi, the Bakufu's special police force in Kyoto on July 8, 1864, at the Ikedaya Inn in Sanjō-Kawaramachi, Kyoto, Japan.

Kōchi Castle (高知城, Kōchi-jō) is an Edo Period Japanese castle in the city of Kōchi, Kōchi Prefecture, Japan. It is located at Otakayama hill, at the center of Kōchi city, which in turn is located at the center of the Kōchi Plain, the most prosperous area of former Tosa Province on the island of Shikoku. From 1601 to 1871, it was the center of Tosa Domain, ruled by the tozama Yamauchi clan under the Tokugawa Shogunate. The castle site has been protected as a National Historic Site since 1959, with the area under protection expanded in 2014.

Sakamoto Ryōma (坂本龍馬 or 坂本竜馬; 3 January 1836 – 10 December 1867) was a Japanese samurai, a shishi and influential figure of the Bakumatsu, and establishment of the Empire of Japan in the late Edo period.

Sakamoto was a low-ranking samurai from the Tosa Domain on Shikoku and became an active opponent of the Tokugawa Shogunate after the end of Japan's sakoku isolationist policy. Under the alias Saitani Umetarō (才谷梅太郎), he worked against the Bakufu, the government of the Tokugawa shogunate, and was often hunted by their supporters and the Shinsengumi. Sakamoto advocated for democracy, Japanese nationalism, return of power to the Imperial Court, abolition of feudalism, and moderate modernization and industrialization of Japan. Sakamoto successfully negotiated the Satchō Alliance between the powerful rival Chōshū and Satsuma domains and united them against the Bakufu. Sakamoto was assassinated in December 1867 with his companion Nakaoka Shintarō, shortly before the Boshin War and the Meiji Restoration.