Regency of Murong Ping
Murong Ping was far less able than Murong Ke, and he was corrupt. Upon hearing about Murong Ke's death, the rival Former Qin's emperor Fu Jiān began considering plans to conquer Former Yan.
Soon, however, Former Yan would apparently have a good chance to conquer Former Qin. In winter 367, Fu Jian's brother Fu Shuang (苻雙) the Duke of Zhao, and cousins Fu Sou (苻廋) the Duke of Wei, Fu Liu (苻柳) the Duke of Jin, and Fu Wu (苻武) the Prince of Yan, rebelled and requested Former Yan resistance, offering to submit to Former Yan. As Fu Sou held the important gateway city of Shancheng (陝城, in modern Sanmenxia, Henan), this opened up the center of Former Qin to Former Yan. However, Murong Ping refused to act, and in late 368, Fu Jiān defeated the four rebel dukes.
In 368 as well, the key official Yue Wan (悅綰), concerned about the growing corrupt practice by noble families of putting commoners into their fiefs—a practice that would mean that those commoners were only responsible to them, not responsible for paying taxes to the empire, leading to the empire's treasury being so lacking that it was unable to pay its officials—petitioned Murong Wei for a reform ending the practice. Murong Wei approved the reform and put Yue in charge of it, and Yue restored over 200,000 people to the tax-paying ranks. The nobles were all resentful of Yue, who died later in 368—and while most historians believed that he died of natural causes, having been already ill previously -- Jin Shu stated that he was assassinated by Murong Ping, who had much to lose from Yue' reform.
In 369, probably at his mother's instigation, Murong Wei married the daughter of her cousin Kezuhun Yi (可足渾翼) as his empress.
Later that year, the Jin general Huan Wen launched a major attack against Former Yan, reaching Fangtou (枋頭, in modern Hebi, Henan), in the vicinity of Former Yan's capital Yecheng, defeating every army that Former Yan sent against him, including a major one led by Murong Wei's older brother Murong Zang (慕容臧) the Prince of Le'an. Murong Wei and Murong Ping panicked and wanted to abandon Yecheng to flee back to the old capital Helong (和龍, in modern Jinzhou, Liaoning). Murong Chui volunteered, however, to make one last try at resistance, and was put in charge of the army. Meanwhile, Murong Wei also sent a messenger to Former Qin to request assistance, promising to cede the Luoyang region to Former Qin in exchange for assistance. Murong Chui and another uncle of Murong Wei, Murong De the Prince of Fanyang, soon dealt Huan a major defeat, and Former Qin forces arrived as well, dealing Huan another defeat.
However, Murong Ping and Empress Dowager Kezuhun soon engaged in two damaging decisions. Still resentful of Murong Chui (whose wife was her sister but whom he did not favor), Empress Dowager Kezuhun denied him and his soldiers rewards and in fact considered killing him, a decision that Murong Ping concurred in because he was also apprehensive of Murong Chui. Murong Chui, hearing the news, fled to Former Qin and became a general for Fu Jiān. They also refused to cede the Luoyang region to Former Qin, as previously promised. In anger, late in 369, Fu Jian sent a 60,000-men force, commanded by his prime minister Wang Meng, against Former Yan.
In spring 370, Wang first advanced on Luoyang and forced its surrender. He then advanced on Hu Pass (壺關, in modern Changzhi, Shanxi), defeating all Former Yan resistance on the way. He then captured Jinyang (晉陽, in modern Taiyuan, Shanxi). Murong Ping led a 300,000-men strong force against Wang, but apprehensive of Wang, he stopped at Lu River (潞川, in modern Changzhi as well). Wang soon arrived to prepare to face off against him. Murong Wei became confident, however, that Wang would be defeated by sheer numbers, and did not appear concerned.
Meanwhile, Murong Ping made the worst display of his corruption at this time—keeping guards at forests and streams, disallowing commoners and even his own soldiers from cutting firewood or fishing unless they paid a usage fee in either money or silk. He soon had a stash of wealth, but completely lost the morale of his soldiers. Murong Wei, hearing this, sent a messenger to rebuke him and ordering him to distribute the wealth to the soldiers, but the damage was done. In winter 370, the armies engaged, and despite the numerical advantage that Murong Ping had, Wang crushed him, and Murong Ping fled back to Yecheng by himself.
Murong Wei, along with his brothers, abandoned Yecheng, intended to flee back to Helong. However, once he got out of the capital, his guards largely abandoned him, and the few faithful guards who remained were soon killed by bandits. Former Qin forces then arrived and captured him and delivered him to Fu Jiān. Fu Jiān released him but had him formally surrender with his officials, ending Former Yan.
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