|Prince of Qi (齊王)|
|Tenure||265 – 283|
|Died||283 (aged 35)|
|House||House of Sima|
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. Sima You fell ill from the stress and died soon after at the age of 36 (by East Asian age reckoning).
- 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.
Prince of QiBorn: 248 Died: 283
| Prince of Qi