Sima Daozi
In summer 399, Sima Yuanxian, wanting even greater power, took an opportunity when his father was very drunk to have Emperor An issue an edict transferring Sima Daozi's authorities to Sima Yuanxian. When Sima Daozi awoke from his stupor, he was enraged, but after that point his power became extremely limited, even though he nominally remained regent.