Emperor Zhuangzong of Tang, personal name Li Cunxu, nickname Yazi (亞子), stage name Li Tianxia (李天下), was the second ruling prince of the Former Jin dynasty who later became the founding emperor of the Later Tang dynasty during the Five Dynasties and Ten Kingdoms period of Chinese history. He was the son of Li Keyong, an ethnic Shatuo Jiedushi of the Tang dynasty.

The Five Dynasties and Ten Kingdoms period was an era of political upheaval and division in Imperial China from 907 to 979. Five dynastic states quickly succeeded one another in the Central Plain, and more than a dozen concurrent dynastic states, collectively known as the Ten Kingdoms, were established elsewhere, mainly in South China. It was a prolonged period of multiple political divisions in Chinese imperial history.