Sima Yue
Sima Yue served as regent for Emperor Hui for several months until winter 306 when, for an unknown reason, Emperor Hui was poisoned while eating bread. (Historians commonly accept Sima Yue as the culprit, but the motive is not clear.) Thus ended the reign of an emperor who suffered much and under whose reign the Jin dynastic system came crashing down, even though he himself should probably not be blamed for it. Crown Prince Chi succeeded him (as Emperor Huai) and would try to restrengthen the empire, but it was too late for Jin by that point. It would end up losing northern and central China to Han Zhao and be forced to relocate to southern China, continued in a branch line of the imperial clan.