He was born in Obiya-machi in the castle town of Kōchi, the fourth son of Yoshida Masakiyo, an upper-ranking samurai of the Tosa domain. His given name was Masaaki, and Tōyō was a pen name. His ancestors had served the Chōsokabe and were later invited by Yamauchi Kazutoyo to serve the Tosa domain. He studied swordsmanship, including the Ittō school.
When his elder half-brother died young, he became heir to the Yoshida house. He was a hot-tempered young man, and was later even ordered into confinement because of his quick temper. Even so, he studied hard and grew into a man with his own views on domain government and coastal defense.
When his father Masakiyo died, he became head of the Yoshida house. In Tosa, the lord Yamauchi Toyoteru was about to launch a rebuilding of domain government. Having inherited the house, Tōyō soon began working as a domain official and stood out for his sharp judgment and drive.
He began serving the domain as ship magistrate and soon became district magistrate, in charge of village administration. Joining lord Toyoteru's reforms, he proposed the Sainōsō, granaries where the domain would store rice against famine. From early on he cared about building systems to protect people's livelihoods.
He left office due to illness but submitted to the domain a five-point proposal on personnel, legal reform and coastal defense. In an age when foreign ships were appearing near Japan, he was thinking seriously about how the domain should prepare. The proposal was recognized, and two years later he returned to domain office.
When his brother-in-law Gotō Masaharu died of illness, he raised the son left behind, Yasuta, the later Gotō Shōjirō, in place of a father. At the end of that year lord Toyoteru died, and Tōyō left office. Gotō would later carry on Tōyō's reforms and become an active statesman of the Meiji era.
He traveled around the Kinki region, meeting the Chinese-learning scholar Saitō Settō of Ise and, in Kyoto, Yanagawa Seigan and Rai Mikisaburō, broadening his knowledge. Talking with scholars and activists beyond Tosa exposed him to national trends and new ideas, giving him the vision that led to his bold later reforms.
In the year Perry arrived, lord Yamauchi Yōdō promoted him to chief inspector, and he soon became councillor, forcefully leading the domain's political reforms. Yōdō highly valued Tōyō's talent. A story tells that Yōdō later said, "Tōyō would have answered that I resemble Oda Nobunaga."
He went to Edo and mixed with scholars, but at a drinking party he struck a hatamoto, was removed from office and had his stipend cut. While confined after being sent back to Tosa, a great earthquake struck, and he is said to have written a Chinese poem lamenting his helplessness, calling himself "a criminal of Tosa". Accounts differ on the year.
He opened a private school, the Shōrin-juku, on the outskirts of Kōchi and taught young retainers such as Gotō Shōjirō, Inui Taisuke (later Itagaki Taisuke), Fukuoka Takachika and Iwasaki Yatarō. These students became a powerful group and grew into figures who moved Tosa's and Japan's politics and economy from the late Edo period into the Meiji era.
Pardoned the year before, he returned to domain government as councillor this year. He issued the law code Kainan Seiten and pressed for promotion regardless of lineage, development of industry, military reform, and opening the country to trade. But these bold reforms provoked conflict with old established families and the Tosa Loyalist Party, which called for revering the emperor and expelling foreigners.
On a rainy night, on his way home from giving a history lecture to lord Yamauchi Toyonori, he was attacked by members of the opposing Tosa Loyalist Party and lost his life. His reforms ended halfway, but those he had raised, such as Gotō Shōjirō and Itagaki Taisuke, later played major roles in the return of power to the court and the new government of Meiji.
Oda NobunagaMatthew C. PerryIwasaki YatarōItagaki TaisukeGoto ShojiroYamauchi Yōdō (Toyoshige)Takechi Hanpeita (Zuizan)Tani Tateki
Hotta MasayoshiSakuma ShōzanIi NaosukeNabeshima Naomasa (Kansō)Shimazu HisamitsuIwase TadanariAbe MasahiroKatsu Kaishū
People of the Edo period ・ People by period
Based on facts found in textbooks and biographies. Uncertain points are marked as such.