Sima You

Full name
	Family name: Sima (司馬); Given name: You (攸); Courtesy name: Dayou (大猷); Childhood name: Taofu (桃符)
Posthumous name
	Prince Xian (獻王)

Sima You
司馬攸
Sima You; 司馬攸
Prince of Qi (齊王)
Tenure	265 – 283
Predecessor	Cao Fang
Successor	Sima Jiong
Born	248
Died	283 (aged 35)
Spouse	Jia Bao
Issue; Detail	Sima Rui (司馬蕤); Sima Shi (司馬寔); Sima Zan (司馬贊); Sima Jiong 司馬冏;
Full name
	Family name: Sima (司馬); Given name: You (攸); Courtesy name: Dayou (大猷); Childhood name: Taofu (桃符)
Posthumous name
	Prince Xian (獻王)
House	House of Sima
Father	Sima Zhao
Mother	Wang Yuanji

Sima You (248–283), courtesy name Dayou, was an imperial prince of the Jin dynasty (265–420) of China. He was the second son of Sima Zhao, a regent of the Cao Wei state during the Three Kingdoms period. Sima You became the heir to his uncle, Sima Shi, who at the time was sonless. It is known that Sima You was a person of mild-mannered character who was expected to be appointed emperor, but ended being passed over due to that of his young age. The heir that was chosen was Sima Zhao's first son, Sima Yan (Emperor Wu), who usurped the Cao Wei throne and established the Jin dynasty with himself as the new emperor in 265.

When Emperor Wu appointed his developmentally disabled son heir apparent, he was concerned that his subjects viewed Sima You too favourably. In order to strengthen his son's position, he ordered Sima You away from Luoyang in 282 to a vassal state, despite protestations from their sisters, Princess Jingzhao and Princess Changshan.[1] Sima You fell ill from the stress and died soon after at the age of 36 (by East Asian age reckoning).[2]

Sima You's son, Sima Jiong, was one of the eight princes involved in the War of the Eight Princes during the reign of Emperor Hui, the second emperor of the Jin dynasty.

References

Fang, Xuanling, ed. (648). "列傳第十二" [Historical Biography 12]. 晉書 [Book of Jin] (in Chinese).
Fang, Xuanling, ed. (648). "帝纪第三" [Chronicles of the Emperor]. 晉書 [Book of Jin] (in Chinese).

Chen, Shou. Records of the Three Kingdoms (Sanguozhi).
Fang, Xuanling. Book of Jin (Jin Shu).
Pei, Songzhi. Annotations to Records of the Three Kingdoms (Sanguozhi zhu).
Sima, Guang. Zizhi Tongjian.

Chinese royalty
Prince of Qi House of Sima Born: 248 Died: 283
Preceded by Cao Fang	Prince of Qi 265–283	Succeeded by Sima Jiong

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[fang-1] Fang, Xuanling, ed. (648). "列傳第十二" [Historical Biography 12]. 晉書 [Book of Jin] (in Chinese).

[autogenerated1-2] Fang, Xuanling, ed. (648). "帝纪第三" [Chronicles of the Emperor]. 晉書 [Book of Jin] (in Chinese).