Gao Gan
Guo Yuan was a maternal nephew of Zhong Yao. He was a subordinate of the warlord Yuan Shang. In 202, when the warlord Cao Cao led his forces to attack Yuan Shang and his brother Yuan Tan at the Battle of Liyang, Yuan Shang ordered Gao Gan, Guo Yuan and Huchuquan to lead troops to attack Hedong Commandery (河東郡; around present-day Xia County, Shanxi), which was guarded by Jia Kui, an official under Cao Cao. Jia Kui could not hold up against the attack, so the people in Hedong Commandery offered to surrender to Guo Yuan on the condition that he would not harm Jia Kui. Guo Yuan agreed and captured Hedong Commandery, after which Yuan Shang appointed him as the commandery's Administrator (太守). When Jia Kui refused to surrender to Guo Yuan, the latter wanted to kill him but the people of Hedong Commandery helped Jia Kui escape.