Keiō

Overview

Keiō (慶応) was the Japanese era name that followed Genji and preceded Meiji. The era began on May 1, 1865, and ended on October 22, 1868, spanning roughly three and a half years at the close of the Edo period (1603–1868). Two emperors reigned during this time: Kōmei-tennō (孝明天皇) and his successor Meiji-tennō (明治天皇).

The era name is also written historically as 慶應, an alternate form of the same characters. In modern Japanese usage, 慶応 is the standard spelling, though the older 慶應 variant appears in institutional names such as Keiō University.

What Defined the Era

Keiō was the final era of the Edo period, a time when the Tokugawa shogunate, which had ruled Japan since 1603, was collapsing. The era opened under Emperor Kōmei, whose reign had already seen growing tension between the shogunate and factions demanding the restoration of imperial authority. Kōmei died in early 1867, and his teenage son, Meiji-tennō, ascended the throne during the Keiō years.

The era's defining feature was the transfer of power from the shogunate to the imperial court. The political movement known as sonnō jōi (尊王攘夷, "revere the emperor, expel the barbarians") had gained strength in the preceding years, and by Keiō it had shifted from ideology to action. The shogunate, led by Tokugawa Yoshinobu, attempted reforms to preserve its authority, but the momentum lay with the domains of Satsuma and Chōshū, which sought to overthrow the shogunate in the emperor's name.

Keiō ended with the formal restoration of imperial rule, a transition so complete that the following era, Meiji, became the name of the new imperial state. The era name itself thus marks the hinge between feudal Japan and the modern nation.

Key Events

In 1866, the shogunate launched a punitive expedition against the Chōshū domain, the second such campaign in two years. The expedition collapsed when the shōgun, Tokugawa Iemochi, died at Osaka Castle during the campaign. His successor, Tokugawa Yoshinobu, took office in 1866 and immediately faced the same pressures that had undone his predecessor.

Emperor Kōmei died on January 30, 1867, and Meiji-tennō, then a boy, became emperor. In November 1867, Tokugawa Yoshinobu formally returned his governing authority to the imperial court, an act known as taisei hōkan (大政奉還, "return of the great government"). The shogunate was abolished in name, though Yoshinobu retained substantial power in practice.

The arrangement did not hold. In January 1868, forces loyal to the imperial court and the Satsuma–Chōshū alliance clashed with shogunate troops at the Battle of Toba–Fushimi near Kyoto. The shogunate forces were defeated, and Yoshinobu retreated to Edo. The Boshin War (戊辰戦争, Boshin sensō) followed, with imperial forces advancing eastward. Edo Castle fell in May 1868, and the city was renamed Tokyo. The Keiō era ended on October 22, 1868, when the imperial government proclaimed the new era name Meiji.

The Name in Japanese

The era name is written 慶応 in modern Japanese, with the kana reading けいおう and the romaji Keiō. The name was chosen in 1865 to mark the beginning of a new imperial reign period under Emperor Kōmei.

The name breaks down into two characters:

• 慶 (けい, kei): "celebration" or "rejoicing." The character conveys a sense of happiness, congratulation, and auspiciousness. It appears in words like 慶事 (けいじ, keiji, "a happy event") and 慶祝 (けいしゅく, keishuku, "celebration").

• 応 (おう, ō): "to respond" or "to answer." The character carries the sense of answering, corresponding, or reciprocating. It appears in words like 応答 (おうとう, ōtō, "response") and 反応 (はんのう, hannō, "reaction").

Together, 慶応 suggests something like "joyful response" or "auspicious reply," a name intended to signal a positive turn in the nation's fortunes. The historical variant 應 is the older, traditional form of 応; both characters share the same meaning and reading, but 応 is the simplified form used in modern Japanese orthography.

How the Era Name Works

A Japanese era name, or nengō (年号, literally "year name"), is a system of dating that counts years within a named period. The system originated in China and was adopted in Japan in 645 CE. Each era name is proclaimed by the emperor and remains in effect until a new era is declared.

In the traditional system, an era name could change for several reasons: the death of an emperor, a new emperor's accession, or an auspicious or inauspicious event deemed significant enough to warrant a fresh start. The Keiō era itself was proclaimed in 1865, during the reign of Emperor Kōmei, and continued into the early reign of Meiji-tennō after Kōmei's death in 1867.

The era name system changed fundamentally with the Meiji Restoration. In 1868, the new imperial government decreed that henceforth there would be only one era name per emperor's reign, a practice known as issei ichigen (一世一元, "one era, one reign"). The Keiō era was the last to be changed mid-reign under the old rules. From Meiji onward, each emperor's reign has had a single era name, and the era name has become the posthumous name of the emperor himself: Meiji, Taishō, Shōwa, and so on.