Sima Shi 司馬師

Sima Shi 司馬師 was a military general of Wei. Brother of Sima Zhao and eldest son of Sima Yi. Sima Shi participated in Sima Yi's coup which resulted in the death of the regent of Wei, Cao Shuang. This made the Sima's the sole authority in Wei. When Sima Yi died, Sima Shi inherited his father's authority. In 254 he deposed the Wei emperor Cao Fang and replaced him with Cao Mao. One year later Sima Shi himself passed away and his younger brother Sima Zhao took over his authority.

When Sima Yan, son of Sima Zhao, founded the Jin dynasty, he posthumously titled Sima Shi as Emperor of Jin.

History of Jin official biography
Emperor Jing 景, whose given name is Shi 師, and style name Ziyuan 子元, is the eldest son of Emperor Xuan 宣 [Sima Yi]. He is a cultured and elegant man with impressive charms. He is also a composed and tough man excelling in grand strategies. When he was young, he had earned a nice reputation, and was equally prominent as Xiahou Xuan 夏侯玄 and He Yan 何晏. He Yan used to say, “The only person who could have the great achievements under the heaven is probably Sima Ziyuan.” During the Jingchu 景初 years of the Wei dynasty, he was appointed as Cavalier Attendant-in-Ordinary (sànjí chángshì 散騎常侍), and received a few promotions to the post of Military Protector of the Palace (zhōnghùjūn 中護軍). He devised a system of talent selection, in which official candidates were promoted according to their feats without excess, thus there was no favoritism between them. When Empress Xuanmu 宣穆 [Zhang Chunhua] died, he was known for his filial piety shown during the bereavement.

Fact vs. Fiction
Historically…