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Title: Keiō  
Author: World Heritage Encyclopedia
Language: English
Subject: Meiji period, Japanese era name, Keio (disambiguation), Keio Gijuku (Gakkō Hōjin), Battle of Bonari Pass
Collection: Japanese Eras
Publisher: World Heritage Encyclopedia


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 April 1865 to September 1868.[1] The reigning emperors were Kōmei-tennō (孝明天皇) and Meiji-tennō (明治天皇).


  • Change of era 1
  • Events of the Keiō era 2
  • See also 3
  • Notes 4
  • References 5
  • External links 6

Change of era

  • January 27, 1865 Keiō gannen (慶応元年): The new era name of Keiō (meaning "Jubilant Answer") was created to mark the Kinmon Incident. The previous era ended and a new one commenced in Genji 2.

Events of the Keiō era

  • 1866 (Keiō 2): Goryōkaku completed
  • September 28, 1866 (Keiō 2, 20th day of the 8th month): Shogun Iemochi died at Osaka; and the bakufu petitioned that Hitotsubashi Yoshinobu should be appointed as his successor.[2]
  • January 10, 1867 (Keiō 2, 5th day of the 12th month): Yoshinobu was appointed shogun.[2]
  • January 30, 1867 (Keiō 2, 25th day of the 12th month): Emperor Komei died.[2]
  • November 10, 1867 (Keiō 3, 15th day of the 10th month): An Imperial edict was issued sanctioning the restoration of Imperial government.[2]
  • January 6, 1868 (Keiō 3, 10th day of the 12th month):[3] The restoration of the Imperial government was announced to the kuge. The year 1868 began as Keio 3, and did not become Meiji 1 until the 8th day of the 9th month of Keio 4, i.e., October 23; although retrospectively, it was quoted as the first year of the new era from 25 January onwards.[2]
  • 1868 (Keiō 4, 3rd of the 1st month): The Boshin War begins with the Battle of Toba-Fushimi.
  • September 3, 1868 (Keiō 4, 17th day of the 7th month): Edo was renamed "Tokyo", i.e. meaning "Eastern Capital".[4]
  • October 8, 1868 (Keiō 4, 23rd of the 8th month): Battle of Aizu begins.
  • October 12, 1868 (Keiō 4, 27th day of the 8th month): Emperor Meiji is crowned in the Shishin-den in Kyoto.[5]
  • October 23, 1868 (Keiō 4/Meiji 1, 8th day of the 9th month): The nengō is formally changed from Keiō to Meiji; and a general amnesty is granted.[5]
    • 1868 (Meiji 1, 23rd day of the 10th month): The emperor went to Tokyo; and Edo castle became an Imperial palace.[5]
  • Keio University, which was initially established in 1858 (Ansei 5), seven years before the beginning of the Keiō era, is named after this era. This is the oldest existing institution of higher learning in Japan.[6]

See also


  1. ^ Nussbaum, Louis-Frédéric. (2005). "Keiō" p. 505Japan Encyclopedia, , p. 505, at Google Books; n.b., Louis-Frédéric is pseudonym of Louis-Frédéric Nussbaum, see Deutsche Nationalbibliothek Authority File.
  2. ^ a b c d e Ponsonby-Fane, Richard. (1956). Kyoto: The Old Capital of Japan, 794-1869, p. 326.
  3. ^ Ponsonby-Fane's published nengō would have this be 4 January rather than 6 January.
  4. ^ Ponsonby-Fane, p. 327.
  5. ^ a b c Ponsonby-Fane, p. 328.
  6. ^ Ozaki, Yukio. (2001). The Autobiography of Ozaki Yukio, p. 21.


  • Ozaki, Yukio. (2001). The Autobiography of Ozaki Yukio: The Struggle for Constitutional Government in Japan. [Translated by Fujiko Hara]. Princeton: Princeton University Press. ISBN 9780691050959; OCLC 45363447
  • Nussbaum, Louis Frédéric and Käthe Roth. (2005). Japan Encyclopedia. Cambridge: Harvard University Press. ISBN 978-0-674-01753-5; OCLC 48943301
  • Ponsonby-Fane, Richard A. B. (1956). Kyoto: The Old Capital of Japan, 794-1869. Kyoto: The Ponsonby Memorial Society. OCLC 559477127

External links

  • National Diet Library, "The Japanese Calendar" ...historical overview plus illustrative images from library's collection
  • National Archives of Japan ...Scroll image showing precise reproduction of Imperial standard and colors, Boshin War (1868)
  • Toyohara Chikanobu, Mirror of the Ages (Jidai Kagami): Keiō no koro.
Preceded by
Era or nengō

Succeeded by
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