哀帝
In 364, Emperor Ai, who was obsessed with immortality, was poisoned by pills given him by magicians, and he could not handle important affairs of state. Empress Dowager Chu again served as regent, but important decisions were made by Sima Yu and Huan Wen. In 365, with the Former Yan regent Murong Ke besieging the important city Luoyang, Sima Yu and Huan discussed launching a counterattack to relieve Luoyang, but when Emperor Ai died in spring 365, the plans were cancelled. Emperor Ai was succeeded by his brother Sima Yi the Prince of Langya, who took the throne as Emperor Fei. Sima Yu continued in his role as prime minister.