In 755, the general An Lushan rebelled at Fanyang (范陽, in modern Beijing) and established a new state of Yan. In 756, his forces approached the Tang capital Chang'an, forcing Emperor Xuanzong to flee to Chengdu. Emperor Xuanzong's son and crown prince Li Heng did not follow him to Chengdu, but instead fled to Lingwu, where he was declared emperor (as Emperor Suzong), an act that Emperor Xuanzong later recognized. Emperor Suzong ordered that the key military circuits send armies to aid him. When his order reached Anxi, the military governor Liang Zai (), after consulting with Li Siye, initially decided not to act on the order and to wait for further development. Duan Xiushi rebuked Li Siye: