A general under Cao Wei. The forefather of the Jin Dynasty.
A member of the prestigious Sima family, Sima Yi served several generations of the Cao family. He was particularly trusted by Cao Pi.
Sima Yi was most famous for his successful defense of Wei from Zhuge Liang's invasions. He then staged a coup-d'état, wrestling power from Cao Shuang and making the Sima clan the effective rulers of Wei. This laid the foundations for the Jin Dynasty.