Sima Yi(179~251) was a general, military strategist, and politician of Cao Wei during the Three Kingdoms period.
司马懿(179-251),三国时期曹魏一名大将、军事战略家和政治家。
He is perhaps best known for defending Cao Wei from Zhuge Liang's Northern Expeditions.
他最为人知的就是与诸葛亮的北征相对抗，保护曹魏。
His success and subsequent rise in prominence paved the way for his grandson Sima Yan's foundation of the Jin Dynasty, which would eventually bring an end to the Three Kingdoms period.
司马懿的成功和后来地位的上升为他的孙子司马炎建晋朝铺平了道路。晋朝最后结束了三国鼎立的局面，统一了中国。
After the founding of the Jin Dynasty, Sima Yi was posthumously honored as Emperor Xuan of Jin with the temple name of Gaozu.
晋朝建立后，司马懿被追尊为晋宣帝，庙号高祖。

Sima Yi began his career as Secretary of Literature under Lord Cao. Sima's first military action was against Zhang Lu in Hanzhong.
司马懿初为曹操的文学掾，在征伐张鲁时立大功。
Sima Yi's strategies were a success and Lord Cao was greatly impressed. Cao Pi had a great trust in Sima Yi and titled him Lord of Hejin Precinct. Later in his career, Sima Yi was appointed as Senior Assistant to the Prime Minister.
曹丕信任和器重司马懿，封他为河津亭侯，后任丞相长史。
When Cao Pi's son Cao Rui succeeded the throne, Sima Yi was appointed as Great General of the Flying Cavalry, and was in charge of defending Xiliang district. By a plot of Zhuge Liang, Sima Yi was later dismissed from his office.
曹丕之子，曹睿继位时，司马懿出任骠骑大将军，掌重兵镇守西凉，却被蜀国以离间计致使被罢官。
Without Sima Yi however, Cao Rui and Cao Zhen suffered many losses against Zhuge Liang and his officers. Thus Cao Rui appointed Sima Yi as Great Commander-in-Chief Who Pacifies the West.
后因魏国屡屡败于蜀国，曹睿只好再次起任司马懿为平西都督。
Sima Yi's talents as military strategist and his able leadership prevented Zhuge Liang from gaining the upper hand in the battles between Wei and Shu.
司马懿深通兵法，指挥有度，与蜀国作战期间使诸葛亮难以取得决定性胜利。
In the second year of Beginning Prospects(238), Sima Yi put down the rebellion of Gongsun Yuan and was promoted to Grand Commandant.
景初二年(238)，司马懿镇压公孙渊并升任太尉。
In the first year of Joyous Stability(249), Sima Yi decided that the reign of the weak Wei Emperors needed to stop and pulled off a Coup d'etat. In the process, Cao Shuang and his sympathizers were put to death.
嘉平元年(249 )，司马懿发动兵变消灭独揽大权的曹爽。
In the third year of Joyous Stability(251)，Sima Yi eradicated Wang Ling who usurped against his authority. In the same year, Sima Yi died of natural causes at the age of seventy-two. When his grandson Sima Yan united the land and established the Jin Dynasty, Sima Yi was posthumously titled King Wen.
嘉平三年(251 ) ,司马懿镇压王凌叛乱，并于当年去世，终年72岁。晋国建立时，追尊司马懿为文王。