司馬師
Later that year, Sima Zhao considered whom to make his heir. He strongly considered his talented younger son, Sima You, who had been adopted by Sima Shi because Sima Shi did not have sons of his own, under the rationale that because Sima Shi had great achievement in the Simas' obtaining and retaining of power, the succession should go back to his son. The majority of his advisors, however, recommended his oldest son, Sima Yan, instead, and Sima Zhao finally resolved to make Sima Yan his designated heir.