진군
In 226, when Cao Pi became critically ill, he ordered Cao Zhen, Chen Qun, Sima Yi and others to assist his son, Cao Rui, who later succeeded him as the second emperor of Wei. After his coronation, Cao Rui elevated Cao Zhen from the status of a district marquis to a county marquis under the title "Marquis of Shaoling" (邵陵侯), and promoted him to the position of General-in-Chief (大將軍) in January or February 227.