Li Zhengji
Li Shigu was born in 778, during the reign of Emperor Daizong. His father Li Na was the military governor ("Jiedushi") of Pinglu Circuit who ruled the circuit "de facto" independently from the imperial regime. He had one younger half-brother, Li Shidao. During Li Na's term as military governor, Li Shigu served as the prefect of Qing Prefecture (青州, in modern Weifang, Shandong), a position that Li Na himself had served while Li Shigu's grandfather Li Zhengji was military governor.