Emperor Xizong of Tang, né Li Yan, later name changed to Li Xuan, was an emperor of China's Tang dynasty. He reigned from 873 to 888. He was the fifth son of his predecessor Emperor Yizong and was the elder brother of his successor Emperor Zhaozong. His reign saw his realm overrun by the great agrarian rebellions led by Wang Xianzhi and Huang Chao, and while both were eventually defeated, by the end of Emperor Xizong's reign, the Tang state had virtually disintegrated into pieces ruled by individual warlords, rather than the imperial government, and would never recover, falling eventually in 907.

Emperor Yizong of Tang, né Li Wen, later changed to Li Cui, was an emperor of the Tang dynasty of China. He reigned from 859 to 873. Emperor Yizong was the eldest son of Emperor Xuanzong. After Emperor Xuanzong's death in 859, Emperor Yizong was placed on the throne by the eunuch Wang Zongshi (王宗實), who killed other eunuchs supporting another son of Emperor Xuanzong, Li Zi the Prince of Kui.