In spring 384, Murong Chui declared the establishment of Later Yan, and Murong Nong continued to contribute greatly to the campaigns that he would wage the next year against Former Qin remnants and other generals who had maintained semi-independence in light of Former Qin's collapse. Around the new year 386, Murong Nong stamped out all remaining Former Qin resistance in the You (幽州, modern Beijing, Tianjin, and northern Hebei) and Ping (平州, modern Liaoning) Provinces, including the rebel Yu Yan (餘巖), and further recovered some commanderies that Goguryeo had seized. Murong Chui made him effective viceroy of You and Ping Provinces, in charge of the old Former Yan capital Longcheng (龍城, in modern Jinzhou, Liaoning), and he remained in that post for several years, apparently greatly favored by the people of the region. In 386, Murong Chui created him the Prince of Liaoxi.