When Eiso (Ming) was captured by the Oyrat force in the Tumu Incident, the Imperial Court enthroned his younger brother (Kageyasutei) and imprisoned Eiso after his return.
また、明の英宗(明)が土木の変でオイラト軍に囚われると、朝廷では弟（景泰帝）を帝位につけて帰還後の英宗を幽閉していた。