Man'ei

The Man'ei era, comprising only 1860 to 1861, was the shortest era of the late Edo period, its name meaning "Ten-thousand Extension" masking a year of extraordinary political turbulence. This brief period under Emperor Kōmei's continued reign represents a crucial inflection point when anti-shogunate forces gained momentum and the imperial court became increasingly central to political negotiations over Japan's future. The era's brevity reflected the accelerating pace of historical change as the Tokugawa system spun toward collapse. The Man'ei era began with the shocking Sakuradamon Incident of 1860, when samurai assassins killed the shogunate's most powerful administrator, Ii Naosuke, in a dramatic daylight attack in Edo. This assassination symbolically demonstrated that the shogunate could no longer protect its own senior officials and exposed the fundamental weakness of bakufu authority. The incident emboldened anti-foreign, pro-imperial samurai and intellectuals across Japan, signaling that violence against the shogunate would not be effectively punished. In the assassination's aftermath, various domains began strengthening their own military forces, further fragmenting central authority. Emperor Kōmei's court during Man'ei became an increasingly important political arena. The emperor, now in his late twenties, worked with loyalist advisors to resist shogunate authority and assert imperial prerogative in national decision-making. The court began issuing imperial decrees that contradicted shogunate policy, creating dual centers of power and deepening institutional crisis. The emperor's growing activism marked a decisive shift from his earlier ambiguous position toward explicit imperial restoration ideology. Man'ei's significance lies in its representation of the moment when the shogunate's authority became merely nominal rather than real. The period witnessed the rapid rise of the samurai activist movement, with increasing numbers of lower-ranking samurai (shishi) leaving their domains to engage in political violence and propaganda against the shogunate. Though short-lived as a named era, Man'ei encapsulates the transformation from shogunal dominance to imperial-centered politics that would define the final years of Edo. It stands as a pivotal bridge between the Ansei purges and the Bunkyū political realignment that would follow.