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Keian (慶安?) was a Japanese era name (年号, nengō,?, lit. "year name") after Shōhō and before Jōō. This period started in February 1648 and ended in September 1652.[1] During this time, the emperor was Go-Kōmyō-tennō (後光明天皇?).[2]

Events of the Keian era

Nihon Ōdai Ichiran was first published in the 5th year of Keian
  • 1648 (Keian 1): Legal code about city life and business are established in Osaka[3]
  • 1 April 1649 (Keian 2, 20th day of the 2nd month): There was a major earthquake in Edo.[6]
  • 1651 (Keian 4): Plot to overthrow the Tokugawa, also known as the Keian Uprising.[7]
  • 1652 (Keian 5, 5th month): Nihon Odai Ichiran was published.[8] The French version of this work was the first Japanese history book to be published in the West.

Related pages


  1. Nussbaum, Louis-Frédéric. (2005). "Kei'an" in Japan encyclopedia, p. 503.
  2. Nussbaum, "Go-Kōmyō Tennō," p. 256; Titsingh, Isaac. (1834). Annales des empereurs du japon, p. 412.
  3. Hall, John Whitney. Early Modern Japan, p. xx.
  4. Nihon Gaiji Kyōkai. (1942). Contemporary Japan: a Review of Japanese Affairs, Vol. 11, Part 2, p. 749.
  5. Nussbaum, "Kei'an no ofuregake" at p. 503.
  6. Titsingh, p. 412.
  7. Nussbaum, "Kei'an jinken" at p. 503; Screech, Timon. (2006). Secret Memoirs of the Shogans: Isaac Titsingh and Japan, 1779-1822, pp. 85-89.
  8. Titsingh, pp. 406, 412.

Other websites

Keian 1st 2nd 3rd 4th 5th
1648 1649 1650 1651 1652
Preceded by:
Era or nengō:
Succeeded by: