Emperor Wu of Jin - Life Before Establishment of The Jin Dynasty

Life Before Establishment of The Jin Dynasty

Sima Yan was born to Sima Zhao and his wife Wang Yuanji, daughter of the Confucian scholar Wang Su (王肅), in 236, as their oldest son. At that time, Sima Zhao was a mid-level official in the government of Cao Wei and a member of a privileged clan, as the son of the general Sima Yi. After Sima Yi seized power from the regent Cao Shuang in 249 in the Incident at Gaoping Tombs, Sima Zhao became more influential in the state. After his father's death in 251, Sima Zhao became the assistant to his brother, the new regent Sima Shi. After Sima Shi died in 255, Sima Zhao became regent and the paramount authority in the Wei government.

Sima Yan's first important appearance in history was in 260, when forces loyal to his father, led by Jia Chong, defeated an attempt by the Wei emperor Cao Mao to take back power and killed Cao Mao. At that time, as a mid-level army general, he was commissioned by his father to escort the new emperor Cao Huan from his dukedom to the capital Luoyang. After his father was created the Duke of Jin in 263 in light of the army's conquest of Shu Han, he was named heir. However, at times Sima Zhao hesitated as to whether Sima Yan or his brother Sima You would be the more appropriate heir — as Sima You was considered talented and had also been adopted by Sima Shi, who had no biological sons of his own, and Sima Zhao, remembering his brother's role in the Simas' takeover of power, thought it might be appropriate to return power to his branch of the clan. However, a number of high level officials favored Sima Yan, and Sima Zhao agreed. After he was created the Prince of Jin in 264 (thus reaching the ultimate step before usurpation), Sima Yan was created the crown prince of Jin.

In 265, Sima Zhao died without having formally taken imperial authority. Sima Yan became the Prince of Jin. Later that year, he forced Cao Huan to abdicate, ending the state of Cao Wei and starting the Jin Dynasty.