Emperor Jianwen
An immediate issue that Emperor Jianwen had to deal with upon taking the throne was Huan's suspicions toward his older brother Sima Xi () the Prince of Wuling, whose interest in military matters made Huan concerned that he would oppose Huan. Huan therefore falsely accused him of plotting treason, and Emperor Jianwen agreed to remove Sima Xi from his posts. Subsequently, however, Huan manufactured evidence against Sima Xi and petitioned that he be put to death. Emperor Jianwen wrote to Huan, stating that he did not want to kill his brother—and that if he was forced to, he would instead yield the throne. Huan, not willing to risk a confrontation, settled for having Sima Xi and his sons demoted to commoner status and exiled.