*[[Ivory tally system]] (''Nitchô gafusei''<!--日朝牙符制-->) begins between Japan and Korea.
*[[Ivory tally system]] (''Nitchô gafusei''<!--日朝牙符制-->) begins between Japan and Korea.
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*[[Ming Dynasty|Ming China]] limits [[Kingdom of Ryukyu|Ryukyuan]] [[tribute]] missions to once every two years after members of a Ryukyuan delegation in China killed a couple, burned their house, and stole their possessions.
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*[[Ming Dynasty|Ming China]] limits [[Kingdom of Ryukyu|Ryukyuan]] [[tribute]] missions to once every two years after members of a Ryukyuan delegation in China, led by [[Cai Zhang]] (Sai Shô) kill Ming citizen Chen Erguan and his wife, burn their house, and steal their possessions.
*[[Omura Sumiyoshi|Ômura Sumiyoshi]] is defeated by the [[Arima clan]].
*[[Omura Sumiyoshi|Ômura Sumiyoshi]] is defeated by the [[Arima clan]].