The Xianbei state of Tanshihuai to which the Murong belonged fragmented following the fall of Budugen (187–234), who was the younger brother of Kuitoi (reigned 185–187). Kuitou was the nephew of Tanshihuai's incapable son and successor Helian (reigned 181–185). The Murong consequently broke off and submitted to the Cao Wei dynasty, settling in the Liaoxi area. The Murong ruler at this time was Murong Mohuba (莫护跋), a descendant of the chieftain Murong. Murong Mohuba actively supported Sima Yi's Liaodong campaign in 238, leading an auxiliary Murong force. Mohuba was succeeded in 246 by his son Muyan (木延) who also aided the Cao Wei campaign against the Goguryeo that same year.