Keian

Keian was a Japanese era name after Shōhō and before Jōō. This period spanned the years from February 1648 through September 1652. The reigning emperor was Emperor Go-Komyo of Japan.

Change of era

1648 Keian gannen: The new era name was created in response to criticism that Shōhō was too closely related to Shōbō. The previous era ended and a new one commenced in Shōhō 5, on the 5th day of the 2nd month.

The new era name was drawn from the Chinese classic, The I Ching: "At the end happiness, joy of quiet righteousness, answer the world unlimited" :

Events of the ''Keian'' era

April 1, 1649 : There was a major earthquake in Edo.
1651 : Keian Uprising. Plans by well-organized rōnin to attack several Tokugawa strongholds simultaneously were timely discovered. The attempt plan to overthrow the Edo Bakufu by Marubashi Chūya and Yui Shōsetsu was thwarted.
1652 : Nihon Ōdai Ichiran is first published in Kyoto under the patronage of the tairō Sakai Tadakatsu, daimyō of the Obama Domain of Wakasa Province.