Gao Xianzhi
In 755, An Lushan, the jiedushi of Fanyang (范陽, headquartered in modern Beijing), rebelled against the Tang. Emperor Xuanzong nominally commissioned his son, Li Wan (李琬) the Prince of Rong, the commander of the forces against An's rebels, and put Gao Xianzhi in charge as Li Wan's deputy. Gao gathered 50,000 soldiers from the Chang'an region and took up position at Shang Commandery (陝郡, roughly modern Sanmenxia, Henan). Bian Lingcheng was made Gao's monitor.