Yōuzhōu Jiédùshǐ (幽州), also known as Yōujì Jiédùshǐ (幽薊), Yānjì Jiédùshǐ (燕薊), Fànyáng Jiédùshǐ (范陽), and (盧龍), was a military district during the Tang dynasty. It covered the area of Yānjì (燕薊) in what is now the Beijing and Hebei region. Youzhou was the base of operations for An Lushan as well as one of the revolting three garrisons of Hebei. Tang Xuanzong created the Youzhou Jiedushi in the year 713 as a buffer against the Kumo Xi and Khitans. In the year 742 the jiedushi's name was changed to Fanyang Jiedushi. During the period between 780 and 783 Zhu Tao entitled himself Prince of Jì (冀王).