Dong Yi (Qin dynasty)

Dong Yi was a military general of the Qin dynasty. He surrendered to Xiang Yu after the Battle of Julu in 207 BC. In 206 BC, following the collapse of the Qin dynasty, he was conferred the title of King of Di by Xiang Yu and given part of the lands in Guanzhong as his fief when the latter split the former Qin Empire into the Eighteen Kingdoms.

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Source: Wikipedia