Keian

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.

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.