|Official of Eastern Wu|
|Courtesy name||Mancai (Chinese: 曼才; pinyin: Màncái; Wade–Giles: Man-tsai)|
Yan Jun was from Pengcheng (彭城), which is in present-day Xuzhou, Jiangsu. He was known for being very studious since he was young and was well versed in Confucian classics. When chaos broke out in central China towards the end of the Han dynasty, he migrated to the Jiangdong region in southern China, where he met and befriended other famous scholars such as Zhuge Jin and Bu Zhi. He was known for being sincere, honest and committed to everything he did.
Sometime in the third century, Zhang Zhao recommended Yan Jun to serve under the warlord Sun Quan, who controlled the territories in Jiangdong. Sun Quan appointed him as a Cavalry Commandant (騎都尉) and Assistant Officer (從事中郎). When Sun Quan's general Lu Su died in 217, Sun Quan wanted to let Yan Jun replace Lu and take charge of the military garrison at Lukou (陸口; around present-day Jiayu County, Hubei). The other officials congratulated Yan Jun on his new appointment, but Yan firmly declined to accept it and said, "I'm only a simple scholar and I'm unfamiliar with military affairs. If I take up this appointment which I'm not suited for, there will be regrets later." He spoke very sincerely – to the point of breaking down in tears. Sun Quan then asked him to try riding on a horse, but he fell off after getting on the horse's back, so Sun decided to not let him replace Lu Su. Yan Jun received praise for being candid about his abilities.
In 229, after Sun Quan declared himself emperor and established the state of Eastern Wu, he appointed Yan Jun as Minister of the Guards (衞尉) and sent him as an emissary to Wu's ally state, Shu Han. In Shu, Yan Jun met and received high praise from the Shu chancellor-regent Zhuge Liang. He was known for being generous as he did not keep the gifts and rewards he received from others and instead distributed them among his relatives and close friends. Liu Ying (劉穎), a scholar from Guangling, was an old friend of Yan Jun. Sun Quan heard about Liu Ying's talent and wanted to recruit Liu to serve him but Liu declined on the grounds that he was sick. Not long later, Liu Ying's younger brother, Liu Lue (劉略), died in office while serving as the Administrator (太守) of Lingling Commandery (零陵郡), so Liu Ying travelled to Lingling Commandery to attend the funeral. Sun Quan concluded that Liu Ying was feigning illness so he ordered Liu's arrest. When Yan Jun heard about it, he rushed to Lingling Commandery to inform Liu Ying and brought Liu with him to meet Sun Quan and apologise. Sun Quan was so furious that he dismissed Yan Jun but did not punish Liu Ying. After some time, Yan Jun was recalled to serve in the Wu government and was appointed as the Prefect of the Masters of Writing (尚書令). It is not known when he died, but it was recorded in the Wu Shu (吳書; Book of Wu) that he died at the age of 78 (by East Asian age reckoning). He had two sons: Yan Kai (嚴凱) and Yan Shuang (嚴爽). Yan Kai also served in the Wu administration and his highest appointment was Minister Steward (升平少府).
- (嚴畯字曼才，彭城人也。少耽學，善詩、書、三禮，又好說文。避亂江東，與諸葛瑾、步隲齊名友善。性質直純厚，其於人物，忠告善道，志存補益。) Sanguozhi vol. 53.
- (志林曰：權又試畯騎，上馬墮鞍。) Zhilin annotation in Sanguozhi vol. 53.
- (張昭進之於孫權，權以為騎都尉、從事中郎。及橫江將軍魯肅卒，權以畯代肅，督兵萬人，鎮據陸口。衆人咸為畯喜，畯前後固辭：「樸素書生，不閑軍事，非才而據，咎悔必至。」發言慷慨，至于流涕，權乃聽焉。世嘉其能以實讓。) Sanguozhi vol. 53.
- (權為吳王，及稱尊號，畯嘗為衞尉，使至蜀，蜀相諸葛亮深善之。不畜祿賜，皆散之親戚知故，家常不充。廣陵劉穎與畯有舊，穎精學家巷，權聞徵之，以疾不就。其弟略為零陵太守，卒官，穎往赴喪，權知其詐病，急驛收錄。畯亦馳語穎，使還謝權。權怒廢畯，而穎得免罪。乆之，以畯為尚書令，後卒。) Sanguozhi vol. 53.
- (吳書曰：晙時年七十八，二子凱、爽。凱官至升平少府。) Wu Shu annotation in Sanguozhi vol. 53.
- (畯著孝經傳、潮水論，又與裴玄、張承論管仲、季路，皆傳於世。) Sanguozhi vol. 53.