Shimazu Hisamitsu

Shimazu Hisamitsu, lord of the Satsuma domain, moved from initial caution to backing a coalition against the Tokugawa shogunate. In the account of Japan’s transformation, his change of position mattered because it helped turn Ōkubo Toshimichi’s conviction that the feudal order had to be overthrown into a political and military alliance—one whose aims reached beyond restoring the emperor to power.

Satsuma and the Tokugawa Order

In 1868 Japan remained under the Tokugawa family, whose shoguns had ruled since 1600. The emperor had been sidelined into a ceremonial role, while feudal lords governed and taxed their own domains. Satsuma, ruled by the Shimazu family, retained unusual autonomy in the south and was permitted to trade independently with the outside world through the Ryūkyū Islands. Its position placed it within the shogunate’s system but gave it room to pursue interests beyond the shogun’s direct control.

The wider order was extractive: trade was restricted, farmers faced high taxes, and society was divided into occupational categories. Against this background, Satsuma’s relative autonomy and access to overseas trade made the domain a base from which alternatives to Tokugawa rule could be contemplated. The account does not portray Hisamitsu as the original architect of such a program; that earlier initiative belonged to his predecessor, Shimazu Nariakira.

From Caution to Opposition

Ōkubo Toshimichi, a Satsuma samurai and bureaucrat promoted by Shimazu Nariakira, became increasingly convinced that Japan needed to overthrow the feudal shogunate. His earlier lord had planned to use Satsuma troops to remove the shogun, expand trade with Asia and Europe, abolish the old feudal economic institutions, and build a modern state. Nariakira died in 1858 before that plan could advance, and Hisamitsu, his successor, was at first more circumspect.

Ōkubo eventually persuaded Hisamitsu to support the cause. To rally opposition, they framed it as a response to the emperor’s exclusion from power. That appeal offered a common political banner, but the intended change was more extensive than imperial restoration: the project aimed to remake Japan’s political and economic institutions. Hisamitsu’s shift therefore joined a symbolic claim about rightful rule to a contest over the structure of government itself.

The Alliance and Its Larger Aim

In the autumn of 1867, Ōkubo traveled from Edo to Yamaguchi and met Chōshū leaders on October 14. He proposed that they combine forces, march on Edo, and overthrow the shogun. The leaders of Tosa and Aki were already on board; once Chōshū agreed, a secret Satcho Alliance was formed. Hisamitsu’s support for Ōkubo’s cause helped make this coordination possible, although the account identifies Ōkubo as the proposer of the military plan and does not give Hisamitsu a separate operational role in the meeting.

The alliance’s program was not reducible to a return of authority to the imperial court. Sakamoto Ryūma presented the shogun with an eight-point plan urging him to resign to avert civil war. Its opening clause called for political power to be returned to the Imperial Court and for decrees to issue from the Court; the account emphasizes that the proposals extended beyond that first principle. Hisamitsu’s significance lies in helping bring a powerful domain behind the coalition whose stated imperial cause carried a deeper institutional project.

Significance in the Institutional Argument

The book sets Japan’s shogunate against the possibility of institutional change: Tokugawa institutions had restricted trade and concentrated authority, while the Satsuma leadership’s project envisioned expanded commerce, the end of feudal economic arrangements, and a modern state. Hisamitsu’s movement from circumspection to support marks a political opening for that challenge, rather than a personal narrative developed through private motives or a detailed account of his later fate.

Hisamitsu’s role also illustrates how change depended on political coalitions, not simply on ideas or economic pressures. Ōkubo needed the backing of Satsuma’s ruler; Satsuma and Chōshū then coordinated with other domains. The resulting alliance made the struggle against the shogunate a collective undertaking, while the language of restoring the emperor helped rally support for a transformation whose ambitions were institutional as well as dynastic.