The Shotai Conspiracy (Shotai no hen in Japanese), which occurred in January 901, was a coup in which Emperor Daigo, acting on the false charges of FUJIWARA no Takahira, the Minister of the Left, against SUGAWARA no Michizane, the Minister of the Right, demoted Michizane and sent him into de facto exile to Dazaifu (an outpost in far off Kyushu) as Dazai Gon no Sochi (Deputy Commander of Dazaifu); also, Michizane's children as well as MINAMOTO no Yoshi, the Middle Captain of the Guardsmen of the Right, were either demoted or exiled.
昌泰の変（しょうたいのへん）は、901年（昌泰4年）1月、左大臣藤原時平の讒言により醍醐天皇が右大臣菅原道真を大宰権帥として大宰府へ左遷し、道真の子供や右近衛中将源善らを左遷または流罪にした事件である。