Mount Dingjun
Du Xi ( 190s–231), courtesy name Zixu, was an adviser to the warlord Cao Cao during the late Eastern Han dynasty of China. He was a subordinate of Cao Cao's general Xiahou Yuan. Du Xi proposed to the troops that Zhang He take command after Xiahou Yuan was killed at the Battle of Mount Dingjun. He continued serving as an official in the state of Cao Wei, established by Cao Cao's successor Cao Pi, during the Three Kingdoms period.