Before the installation, Jin's nobles favored Duke Xiang's younger brother Yong.
The mother of Yigao, Consort Muying of Qin, feared the possible persecution after Yong's accession.
During the battle of Hequ, a Jin noble named Han Jue was intentionally tested by Zhao Dun, Han proved himself to be an upright person in the battle and Zhao promoted him to the position of Sima(司馬).
[4] When the young duke Yigao grew older, Dun gradually lost his control over him.
His cousin Zhao Chuan killed the duke in a peach plantation while Dun was fleeing.