He was the younger brother of Emperor Ming and installed by military leader Huan Wen. However, the Jianwen Emperor became wary of Zhu Di and tried to arrest him later but failed. Emperor Jianwen of Jin (; 320 – September 12, 372), personal name Sima Yu (司馬昱), courtesy name Daowan (道萬), was an emperor of the Eastern Jin Dynasty (265-420) in China. Emperor Mu's mother Empress Dowager Chu became regent, but she largely followed the advice of prime minister He Chong (何充). Emperor Jianwen of Jin (; 320 – September 12, 372), personal name Sima Yu (司馬昱), courtesy name Daowan (道萬), was an emperor of the Eastern Jin Dynasty (265-420) in China. Later, Zhu Di feigned illness and madness to convince the Jianwen Emperor to release three of his sons, who were being kept as hostages in Nanjing to prevent Zhu Di from rebelling against the emperor. In 323, Emperor Yuan died. 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. Emperor Jianwen soon died, and was succeeded by his 10-year-old son Sima Yao, whom he created crown prince right before his death. Emperor Jianwen of Jin (; 320 – September 12, 372), personal name Sima Yu (司馬昱), courtesy name Daowan (道萬), was an emperor of the Eastern Jin Dynasty (265-420) in China. He was the younger brother of Emperor Ming and installed by military leader Huan Wen. He was the younger brother of Emperor Ming and installed by military leader Huan Wen. Emperor Jianwen of Jin, personal name Sima Yu, courtesy name Daowan, was an emperor of the Eastern Jin Dynasty in China.He was the younger brother of and installed by military leader Huan Wen. In 322, Emperor Yuan created him the Prince of Langye—the same title that Emperor Yuan had earlier, which was therefore considered a special honor. Huan, not willing to risk a confrontation, settled for having Sima Xi and his sons demoted to commoner status and exiled. As Huan himself died in early 373, the threats of a Huan usurpation dissipated, and Jin continued for several decades longer. Prior to taking the throne, he had served in important roles in the administrations of his grandnephews , , and . Emperor Jianwen of Jin (simplified Chinese: 晋简文帝; traditional Chinese: 晉簡文帝; pinyin: Jìn Jiǎnwén Dì; Wade–Giles: Chin Chien-wen-ti; 320 – September 12, 372), personal name Sima Yu (司馬昱), courtesy name Daowan (道萬), was an emperor of the Eastern Jin Dynasty (265-420) in China. During Emperor Mu's reign. In 344, another nephew of Sima Yu, Emperor Kang (Emperor Cheng's younger brother), died, and was succeeded by his infant son Emperor Mu.