The Rise of Yesün Temür
In September 1323 Gegeen Khan was assassinated at Nanpo by a group led by the censor-in-chief Tegshi, with Esen Temür among the plotters. Tegshi was the adopted son of the late chancellor Temüder, whose associates the emperor had been purging. The conspirators offered the throne to Yesün Temür.
According to the official history of the Yuan, Yesün Temür seized the conspirators' envoy, Walus, and sent a warning to Shidebala that arrived too late. Many historians doubt this. Yesün Temür was the chief beneficiary of the plot and probably a party to it; his steward, Dawlat Shah, is said to have been in close contact with the conspirators.
With the imperial seal handed over by the conspirators, he was enthroned in Mongolia in October 1323. At first he rewarded them, making Esen Temür grand councillor of the right and giving Tegshi charge of the Bureau of Military Affairs.
Aware that he would be suspected of a part in the murder, he soon changed course. Before entering Dadu and Shangdu he had Esen Temür, Tegshi and others put to death, fearing that he would otherwise become their puppet. Five princes involved in the plot were exiled to Hainan, Yunnan and other distant places.
Chinese officials urged him to extend the purge to all of Temüder's and Tegshi's former allies and their families. He refused and issued an amnesty instead.