Emperor Zhuangzong of Later Tang (Chinese: 後唐莊宗), personal name Li Cunxu (Chinese: 李存朂 or 李存勗 or 李存勖; pinyin: Lǐ Cúnxù), nickname Yazi (亞子), stage name Li Tianxia (李天下), was the ruling prince of the Former Jin dynasty (r. 908–923) and later became the founding emperor of the Later Tang dynasty (r. 923–926) 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.