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After Murong Chui officially declared independence and established Later Yan later in 384, Murong Lin served as one of his generals in campaigns against Former Qin remnants, semi-independent warlords, and other states. He appeared to be effective in these campaigns. In 386, Murong Chui created him the Prince of Zhao. In 386-387 and 390-391, he commanded armies to, in conjunction with the Later Yan vassal Northern Wei's prince Tuoba Gui, fight the Xiongnu chieftain Liu Xian (劉顯) and later other rebels that threatened Tuoba Gui's safety. It was in 391 when he saw Tuoba Gui's abilities, and he recommended to Murong Chui to force Tuoba Gui to take up residence at the Later Yan capital Zhongshan (中山, in modern Baoding, Hebei) and entrust Northern Wei to a brother. Murong Chui refused.