Fan Yanguang
In 937, Fan Yanguang the military governor of Tianxiong Circuit (天雄, headquartered at Yedu) rebelled against Emperor Gaozu. Initially, Emperor Gaozu ordered Gao to attack Yedu from the west, but then decided to attack Fan himself, instead making Gao the defender of Luoyang and the mayor of Henan Municipality (河南, i.e., the Luoyang region) to defend it in Emperor Gaozu's absence. Gao wanted to carry out a major construction project to remodel the palaces at Luoyang, but at the urging of the official Xue Rong (), Emperor Gaozu did not approve the project. After Fan surrendered later in the year, Emperor Gaozu initially made Yang Guangyuan the military governor of Tianxiong, but later, fearing that Tianxiong was too powerful of a military command and Yang was difficult to control, decided to divide Tianxiong — carving out Yedu itself out as Guangjin Municipality () and making Gao its defender and mayor, while dividing the rest of Tianxiong into two circuits.