Shi Siming
From 710, the head of the government in Youzhou became a " jiedushi", a military regional commander. In 742, Youzhou was renamed Fanyang Commandery (范阳郡). In 759, during the An–Shi Rebellion, Shi Siming declared himself emperor of the Great Yan dynasty and made Fanyang, Yanjing (燕京) or “the Yan Capital.” After the rebellion was suppressed, the seat of government became Youzhou Lulong Dudufu (幽州卢龙都督府).