Sima Yi (179–251) was a general, politician and regent of the state of Cao Wei (220–266) in the Three Kingdoms period (220–280) in China. Two of his sons, Sima Shi (208–255) and Sima Zhao (211–265), rose to power in the 250s and consecutively served as regents throughout the reigns of the last three Wei emperors. After Sima Zhao died in September 265, his son Sima Yan (236–290) forced the last Wei ruler, Cao Huan (246–303), to abdicate the throne in his favour in February 266, ending the Wei regime and establishing the Jin dynasty (266–420). This article contains the family trees of Sima Yi, his brothers, and their descendants up to Sima Yan's generation. For more details on the family trees of the Jin emperors (Sima Yan's generation and beyond), see Chinese emperors family tree (early)#Jin Dynasty and Chu.