Emperor Fei of Jin (simplified Chinese: 晋废帝; traditional Chinese: 晉廢帝; pinyin: Jìn Fèi Dì; Wade–Giles: Chin Fei-ti; 342 – November 23, 386), personal name Sima Yi (司馬奕), courtesy name Yanling (延齡), was an emperor of the Eastern Jin Dynasty in China.
Even though Emperor Fei was an adult, he did not have actual power, as not only were governmental matters largely in the hands of his granduncle Sima Yu the Prince of Kuaiji, but Sima Yu himself was not fully able to make decisions, as the paramount general Huan Wen imposed many of his own decisions on the imperial government, which had no choice but to accept.
Late in 365, the general Sima Xun, the governor of Liang Province (梁州, modern southern Shaanxi) rebelled, but he was defeated, captured, and executed in summer 366.
He spread rumors that Emperor Fei was impotent and unable to bear children—and that his sons, by his concubines Consort Tian and Consort Meng, had in fact been biological sons of men that he favored, Xiang Long (相龍), Ji Hao (計好), and Zhu Lingbao (朱靈寶).
In December 371, Huan then went to the Jiankang and intimidated Empress Dowager Chu, to issue an edict that he had drafted deposing Emperor Fei.
Huan, apprehensive that the former emperor may try to return to the throne, had him exiled to Wu (吳縣, in modern Suzhou, Jiangsu) and put under heavy guard.
In winter 372, the Taoist agrarian rebel Lu Song (盧悚) claimed to have an edict from Empress Dowager Chu to restore Emperor Fei, and he sent a messenger to the duke to persuade him to join the rebellion.
In exile, the former emperor constantly feared death, so he spent his time indulging drinking, music, and women, to show to Huan that he had no desire for political actions.