Editing Northern Yan (section)

=== Background ===
[[Gao Yun (emperor)|Gao Yun]] was a descendant of the [[Goguryeo]] royal family. When the [[Former Yan]] captured the Goguryeo capital, [[Hwando]] in 342, they also captured several members of the royal family and moved them to Qingshan (青山, in modern [[Jinzhou]], [[Liaoning]]), where Gao Yun was born and grew to become a minor general under the Later Yan. In 397, Gao Yun helped the Yan emperor, [[Murong Bao]] quell the rebellion of his son, [[Murong Hui (Later Yan)|Murong Hui]]. As a reward, Bao adopted him as his own son, changing his name to Murong Yun. 

It was around this time when Murong Yun became friends with the general, [[Feng Ba]]. Feng Ba was a [[Han Chinese]] whose family was originally from [[Changle Commandery]] before his grandfather, Feng He (馮和) moved to [[Shangdang Commandery|Shangdang]] during the [[Disaster of Yongjia]]. Ba's father, Feng An (馮安) served as a military general under the [[Western Yan]]. After Later Yan conquered Western Yan in 394, the Feng clan resettled in [[Longcheng District|Longcheng]]. Feng Ba appeared to have grown up under heavy Xianbei influence, as his nickname Qizhifa (乞直伐) suggests Xianbei origin.

In 401, Murong Yun's adoptive uncle, [[Murong Xi]] came to power, and he was described in records as a cruel and arbitrary ruler. Feng Ba and his brother, [[Feng Sufu]] were charged with crimes against Xi, forcing them to flee to the countryside where they were determined to overthrow him. In 407, as Murong Xi was holding a funeral for [[Fu Xunying|Empress Fu]], Feng Ba and his conspirators took control of the capital Longcheng and acclaimed Murong Yun as their leader. Xi initially led an assault on Longcheng but then fled the battle alone in panic. After his forces collapsed, Xi was later found and executed by Yun.