李德裕
Emperor Xuanzong honored his mother Consort Zheng as empress dowager. Immediately after taking the throne, Emperor Xuanzong acted against the powerful chancellor Li Deyu, who had dominated the court during Emperor Wuzong's reign, as he despised Li Deyu for monopolizing power. Emperor Xuanzong removed Li Deyu from his chancellor position and sent him out of the capital Chang'an to serve as the military governor of Jingnan Circuit (荊南, headquartered in modern Jingzhou, Hubei), and also removed Li Deyu's fellow chancellor Zheng Su. Over the next few years, Emperor Xuanzong purged those officials he considered sympathetic to Li Deyu, and further pursued charges against Li Deyu based on Li Deyu having executed the minor official Wu Xiang () on charges that should not have warranted death (Li Deyu was resentful of Wu Xiang's uncle Wu Wuling (). Li Deyu was repeatedly demoted and sent farther and farther away from Chang'an, eventually dying in exile around the new year 850 in Yai Prefecture (崖州, in modern Haikou, Hainan). These actions were considered to have largely ended the factionalism among imperial officials known as the Niu–Li factional strife, which had plagued the imperial government ever since the reign of Emperor Muzong.