After Zhong Hui's rebellion was defeated, Sima Zhao was granted the title of King of Jin on 2 May 264, the penultimate step to usurpation. He set out to revise the laws and the civil service system in accordance with how he would want his own empire to be, such as instating the Five Feudal Ranks of Zhou (a system which had fallen out of use since the Qin dynasty abolished it), and also going on to posthumously enfeoff his father, Sima Yi, and older brother, Sima Shi, as King Xuan of Jin and King Jing of Jin respectively. He further sought peace with Eastern Wu, to prevent further complications for his planned takeover, a gesture that was reciprocated.