Emperor Cheng of Jin

Full name
	Family name: Sīmǎ (司馬); Given name: Yan (衍);
Era dates
	Xianhe (咸和): 326 – 335; Xiankang (咸康): 335 – 342
Posthumous name
	Emperor Chéng; 成皇帝 (lit. "successful")
Temple name
	Xianzong (顯宗)

Emperor Cheng of Jin
晉成帝
Emperor Cheng of Jin; 晉成帝
3rd Emperor of Eastern Jin Dynasty
Reign	19 October 325 – 26 July 342
Predecessor	Emperor Ming
Successor	Emperor Kang
Regent	Yu Wenjun; Yu Liang
Born	December 321 or January 322
Died	26 July 342 (aged 21); Jiankang, Eastern Jin
Burial	Xingping ling (興平陵), Nanjing, Jiangsu
Spouse	Du Lingyang; Consort Zhou
Issue	Emperor Ai; Emperor Fei
Full name
Full name
	Family name: Sīmǎ (司馬); Given name: Yan (衍);
Era dates
	Xianhe (咸和): 326 – 335; Xiankang (咸康): 335 – 342
Posthumous name
	Emperor Chéng; 成皇帝 (lit. "successful")
Temple name
	Xianzong (顯宗)
House	House of Sima
Dynasty	Eastern Jin
Father	Emperor Ming
Mother	Yu Wenjun

Emperor Cheng of Jin (Chinese: 晉成帝; pinyin: Jìn Chéng Dì; Wade–Giles: Chin Ch'eng-ti; December 321 or January 322^[1] – 26 July 342^[2]), personal name Sima Yan (司馬衍), courtesy name Shigen (世根), was an emperor of the Chinese Eastern Jin dynasty. He was the eldest son of Emperor Ming and became the crown prince on April 1, 325. During his reign, the administration was largely dominated by a succession of regents—initially his uncle Yu Liang, then Wang Dao, then the joint administration of He Chong and another uncle Yu Bing. He became emperor at age four, and soon after his accession to the throne, the disastrous rebellion of Su Jun weakened Jin forces for decades.

^ Volume 91 of Zizhi Tongjian recorded that Emperor Cheng was born in the 11th month of the 4th year of the Taixing era of his grandfather Sima Rui's reign. This corresponds to 6 Dec 321 to 4 Jan 322 in the proleptic Gregorian calendar. [(太興四年)十一月，皇孙衍生。]
^ According to Emperor Cheng's biography in Book of Jin, he died aged 22 (by East Asian reckoning) on the guisi day of the 6th month of the 8th year of the Xiankang era of his reign. This corresponds to 26 July 342 in the proleptic Gregorian calendar.[(咸康八年六月)癸巳，帝崩于西堂，时年二十二...] Jin Shu, vol. 07

[1] Volume 91 of Zizhi Tongjian recorded that Emperor Cheng was born in the 11th month of the 4th year of the Taixing era of his grandfather Sima Rui's reign. This corresponds to 6 Dec 321 to 4 Jan 322 in the proleptic Gregorian calendar. [(太興四年)十一月，皇孙衍生。]

[2] According to Emperor Cheng's biography in Book of Jin, he died aged 22 (by East Asian reckoning) on the guisi day of the 6th month of the 8th year of the Xiankang era of his reign. This corresponds to 26 July 342 in the proleptic Gregorian calendar.[(咸康八年六月)癸巳，帝崩于西堂，时年二十二...] Jin Shu, vol. 07

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