Feng Yi (died 365), courtesy name Zizhuan, was a Chinese official of Former Yan during the Sixteen Kingdoms period.
Feng distinguished himself during Murong Huang's tenure as Duke of Liaodong, consecutively defeating the rival Duan and Yuwen Xianbei clans, and later participating in the Yan-Wei War, in which he conquered Bohai and helped capture Ran Min.
Feng Yi's family originated from Tiao County (蓨縣, in modern Hengshui, Hebei) in Bohai Commandery.
The official, Sun Ji (孫機) also ceded Xiangping (襄平, in modern Liaoyang, Liaoning) over to Ren.
The following year in 334, Feng Yi campaigned against the Xianbei leader, Mudi (木堤) at Bailang (白狼; near present-day Lingyuan, Liaoning) and killed him.
As a result, Han was badly defeated by Duan Lan at Niuwei Valley (牛尾谷; north of Liucheng).
Huang suspected that his enemies were not content with their results and would return soon, so he had Feng Yi prepare an ambush at Mount Madou (馬兜山) in Liucheng.
Surely enough, Duan Liao led his troops to attack Liucheng again but Feng Yi ambushed him from two sides and defeated him, even killing his general Rong Bobao (榮伯保).
In November, Feng Yi and a number of ministers pushed Murong Huang to claim the title of Prince of Yan.
Huang agreed, and on the 23 November, he declared himself Prince of Yan, and appointed Feng Yi the Chancellor of the State.
[4] In 338, the ruler of Later Zhao, Shi Hu, attacked Yan and placed its capital Jicheng (棘城, in modern Jinzhou, Liaoning) under siege following the breakdown of their alliance against the Duan tribe.
He pointed out that the campaign had been costly for Shi Hu and that the Zhao army were already worn down due to the long distance that they had travelled.
[5] After days of fierce fighting, the Zhao soldiers eventually retreated, Huang's son Murong Ke pursued and dealt them a heavy defeat.
In September that year, Murong Jun sent Feng Yi and Gao Kai (高開) to subjugate Wei's portion of Bohai commandery, which was defended by its Administrator, Pang Yue (逄約).
At the end of 352, Feng Yi, along with 210 Yan officials, presented a petition urging Murong Jun to claim the title of Emperor, which he agreed to.
Because of this, Feng Yi told Murong Jun to stop officials from sending their agents to carry out drafts and levies and instead let the local offices to handle these issues.