Emperor Zhaozong of Tang
Li Cunxu was born in 885, at Jinyang (i.e., Taiyuan), during the reign of Emperor Zhaozong of Tang. His father was the late-Tang Dynasty major warlord Li Keyong the military governor of Hedong Circuit (河東, headquartered in modern Taiyuan, Shanxi). His mother was Li Keyong's concubine Lady Cao. He was Li Keyong's oldest biological son.