Keiō
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Keiō (慶応; historically 慶應) was a Japanese era name (年号, nengō; literally "year name") after Genji and before Meiji. The period spanned the years from May 1865 to October 1868. The reigning emperors were Kōmei-tennō (孝明天皇) and Meiji-tennō (明治天皇).