Emperor Tang Muzong , born Li Heng, was the 12th emperor of the Tang dynasty of China. He reigned from 820 to 824. Muzong was the son of emperor Xianzong. He was created crown prince in 812 during the reign of his father but after his father was allegedly poisoned by corrupt officials, Muzong was proclaimed emperor in the firsth month of 820.
After succeeding the throne, Muzong spent his time throwing parties and heavy drinking thereby neglected his duties as emperor. Meanwhile, the temporarily subdued regional military governors began to start challenging the central Tang government. Internally, corruptions was rife however Muzong all but ignored the situation.
Muzong brief reign came to an end in the first month of 824. He was only thirty. His reign would mark the downward spiral of the Tang dynasty.