Yu Jin
Yu Jin was born in Juping County (), Taishan Commandery (), which is in present-day Tai'an, Shandong, in the late Eastern Han dynasty. In the early 180s, when the Yellow Turban Rebellion broke out, Yu Jin responded to the Han government's call for volunteers to serve in the imperial army and help to suppress the revolt. He became a subordinate of the general Bao Xin, who was based in Yan Province (covering present-day southwestern Shandong and eastern Henan).