仇士良
In spring 840, Emperor Wenzong became gravely ill. He had his trusted eunuchs Liu Hongyi () and Xue Jileng () summon Yang Sifu and Li Jue to the palace, to entrust Li Chengmei to them. However, the powerful eunuchs Qiu Shiliang and Yu Hongzhi (), who were not consulted, opposed Li Chengmei, and therefore forged an edict in Emperor Wenzong's name, demoting Li Chengmei back to being the Prince of Chen, while creating another younger brother of Emperor Wenzong's, Li Chan the Prince of Ying, crown prince. Emperor Wenzong soon died, and Li Chan became emperor (as Emperor Wuzong). At Qiu's urging, Emperor Wuzong ordered Li Rong, Li Chengmei, and Consort Yang to commit suicide. During the brief mourning period, Yang Sifu served as regent.