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Keiô, literally "rejoicing answer," is the 243rd nengo in the Japanese calendar, corresponding to the period between 1865 and 1868 CE. Komei was the emperor. It was the last era in which the bakufu of Edo ruled Japan.

The major events of the Keio period include:

The era ended in September of 1868, when the Meiji era began.

< Genji - Keio - Meiji >


The other Keiô is a commuter rail line in Tokyo. It gets its name from the fact that it connects Tokyo (the last character of which can also be read "kei") and Hachioji (the middle character of which is "o"). Limited express trains take 34 minutes to run the entire length of the line.

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