仇士良
In 840, Emperor Wenzong died and was succeeded by his younger brother, Emperor Wuzong — who was not the choice of Emperor Wenzong (who wanted their nephew Li Chengmei to succeed him) or the chancellors Yang Sifu (whom Emperor Wuzong later believed had supported another brother of his, Li Rong the Prince of An) and Li Jue (whom Emperor Wuzong later believed had supported Li Chengmei), both of whom were considered Niu Faction leaders by later historians — but was chosen by the powerful eunuchs Qiu Shiliang and Yu Hongzhi (). As Emperor Wuzong did not trust Yang or Li Jue, he removed them from their chancellor posts, and, as Yang Qinyi had recommended Li Deyu, he decided to recall Li Deyu from Huainan to serve as chancellor.