Sima You (246 – 27 April 283),

courtesy name A courtesy name (), also known as a style name, is a name bestowed upon one at adulthood in addition to one's given name. This practice is a tradition in the East Asian cultural sphere, including China, Japan, Korea, and Vietnam.Ulrich Theo ...

Dayou, was an imperial prince of the Western Jin dynasty of China. He was the second son of Sima Zhao, a regent of the

Cao Wei Wei ( Hanzi: 魏; pinyin: ''Wèi'' <

Middle Chinese

: *''ŋjwei^C'' < Three Kingdoms The Three Kingdoms () from 220 to 280 AD was the tripartite division of China among the dynastic states of Cao Wei, Shu Han, and Eastern Wu. The Three Kingdoms period was preceded by the Eastern Han dynasty and was followed by the West ...

period, and Zhao's wife

Wang Yuanji Wang Yuanji (217 – 20 April 268) was a Chinese noble lady, aristocrat and later empress dowager of Jin dynasty, who lived during the Three Kingdoms period. She was the wife of Sima Zhao, a regent of the state of Cao Wei during the Three K ...

. Sima You became the heir to his uncle,

Sima Shi Sima Shi () (208 – 23 March 255), courtesy name Ziyuan, was a military general and regent of Cao Wei during the Three Kingdoms period of China. In 249, he assisted his father Sima Yi in overthrowing the emperor Cao Fang's regent Cao Shuang, a ...

, who eventually died without any sons. It is known that Sima You was a person of mild-mannered character, who was expected to become King of Jin, but ended up being passed over due to his young age. The heir that was eventually 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 February 266. Sima You was made Prince of Qi on 9 February 266.''dingmao'' day of the 12th month of the 1st year of the ''Taishi'' era, per Sima Yan's biography ''in Book of Jin''. When Emperor Wu appointed his

developmentally disabled Developmental disability is a diverse group of chronic conditions, comprising mental or physical impairments that arise before adulthood. Developmental disabilities cause individuals living with them many difficulties in certain areas of life, espe ...

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 Luoyang is a city located in the confluence area of Luo River and Yellow River in the west of Henan province. Governed as a prefecture-level city, it borders the provincial capital of Zhengzhou to the east, Pingdingshan to the southeast, Nanyan ...

in 282 to his fiefdom of Qi, despite protestations from their sisters, Princess Jingzhao and

Princess Changshan Princess Changshan is the formal title of a daughter of the regent of the state of Cao Wei, Sima Zhao. Her personal name is unknown. Biography Princess Changshan is recorded as having been blind in both eyes,Fang Xuanling (678), Biography 12 ...

. Sima You fell ill from the stress and died soon after at the age of 36 (by East Asian age reckoning). 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

* Chen, Shou. ''

Records of the Three Kingdoms The ''Records or History of the Three Kingdoms'', also known by its Chinese name as the Sanguo Zhi, is a Chinese historical text which covers the history of the late Eastern Han dynasty (c. 184–220 AD) and the Three Kingdoms period (220� ...

'' (''Sanguozhi''). * Fang, Xuanling. ''

Book of Jin The ''Book of Jin'' is an official Chinese historical text covering the history of the Jin dynasty from 266 to 420. It was compiled in 648 by a number of officials commissioned by the imperial court of the Tang dynasty, with chancellor Fang ...

'' (''Jin Shu''). * Pei, Songzhi. ''

Annotations to Records of the Three Kingdoms Annotations to Records of the Three Kingdoms () by Pei Songzhi (372-451) is an annotation completed in the 5th century of the 3rd century historical text ''Records of the Three Kingdoms'', compiled by Chen Shou. After leaving his native land, Pei ...

'' (''Sanguozhi zhu''). * Sima, Guang. ''

Zizhi Tongjian ''Zizhi Tongjian'' () is a pioneering reference work in Chinese historiography, published in 1084 AD during the Northern Song dynasty in the form of a chronicle recording Chinese history from 403 BC to 959 AD, covering 16 dynast ...

''. {{DEFAULTSORT:Sima, You 248 births 283 deaths Cao Wei politicians Jin dynasty (266–420) imperial princes Jin dynasty (266–420) politicians