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|Official of Cao Cao|
|Died||217 (aged 46)|
|Courtesy name||Boda (traditional Chinese: 伯達; simplified Chinese: 伯达; pinyin: Bódá; Wade–Giles: Po-ta)|
After this, he entered the service of Cao Cao, and was subsequently given the position of regional governor (太守) and then director of provincial regions (地方官吏). In these positions, it is said that he adopted policies with the common people in mind, and because of this he was greatly admired by them. His accomplishments were recognized by Cao Cao, and he was recalled to the court to take the position of assistant to the Prime Minister (丞相主簿). After this he was further promoted to the rank of governor (刺史) and again showed his administrative abilities. Once again adopting policies with the common people in mind, it is said that he was loved by a great many people.
Despite his accomplishments, however, he never ceased to praise those of his younger brother, Sima Yi. He went so far as to say, "I don't even come close to matching his abilities."
In the year 217, he accompanied Xiahou Dun and Zang Ba on a military expedition against Eastern Wu. During the campaign, a terrible illness broke out among the camp and many soldiers, as well as Sima Lang, fell ill. It is said that Sima Lang chose to distribute his medicine among the soldiers, refusing to take any of it himself. Because of this, he soon succumbed to the illness and died.