Cheng Han
In 348, after Huan Wen destroyed Cheng Han and merged its territory into Jin's, key officials of the Jin imperial government began to fear that he would use his military might to try to dominate the government. The regent for Emperor Mu, Sima Yu the Prince of Kuaiji therefore invited Yin to participate in important government decisions. Yin and Huan immediately developed a rivalry and suspected each other of treachery.