The Simotsuki Incident was a political change in the Kamakura bakufu (Japanese feudal government headed by a shogun) that occurred in Kamakura in the latter half of the Kamakura period on December 21, 1285.
霜月騒動（しもつきそうどう）とは、鎌倉時代後期の弘安8年（1285年）11月17日(旧暦)に鎌倉で起こった鎌倉幕府の政変。