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Sima You (248–283), courtesy name Taiyou (大猷), was the second son of the Cao Wei regent Sima Zhao during the Three Kingdoms period. Sima You became the heir to his uncle, Sima Shi, who at the time was childless. It is known that Sima You was a person of mild-mannered character who 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 oldest son Sima Yan, who established the Jin Dynasty not too long later after his succession.
When Sima Yan appointed his developmentally disabled son heir apparent, he was concerned that the court 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 age 36.
Prince of QiBorn: 248 Died: 283
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