Li Zhengji
It is not known when Li Shidao was born. His father was Li Na, who was military governor ("Jiedushi") of Pinglu Circuit from 784 to 792 and who had inherited the circuit from Li Shidao's grandfather Li Zhengji. His mother was a daughter of Li Zhengji's ally Li Baochen, who had ruled Chengde Circuit (成德, headquartered in modern Shijiazhuang, Hebei). He had one older half-brother, Li Shigu, who inherited the circuit after Li Na's death in 792.