慕容農
Throughout the next few years, Murong Long largely served as a general directly under his father's command, as Later Yan tried to establish itself over the old territory of Former Yan. In 384, when Murong Chui was nearly trapped by an ambush by the Former Qin viceroy Fu Pi, Murong Long was the one who rescued him from the encounter. In 386, Murong Chui created him the Prince of Gaoyang. He continued to distinguish himself in campaigns against independent warlords and Jin generals. In 389, when his brother Murong Nong, himself a distinguished general, was recalled from his post as viceroy at the old Former Yan capital Longcheng (龍城, in modern Jinzhou, Liaoning), Murong Long replaced him as viceroy, and he followed Murong Nong's policies. The populace favored him as much as Murong Nong.