Liu Can
In spring 317, Liu Can finally readied his plan to eliminate his uncle Crown Prince Ai. He falsely informed Crown Prince Ai that Pingyang was under attack and that his subordinates should arm themselves to prepare for the attack. Then, Liu Can informed his father that Crown Prince Ai was ready to attack—and when Liu Cong's messengers then saw Crown Prince's associates armed, they believed Liu Can's accusations and reported back to Liu Cong. Liu Can then further interrogated Crown Prince Ai's subordinate Di and Qiang chiefs (whom Crown Prince Ai commanded, based on his secondary title of Grand Chanyu) under torture, and the Di and Qiang chiefs were forced to falsely confess to a plot. Crown Prince Ai's associates and troops were all massacred—estimated at the cost of 15,000 men—and Crown Prince Ai was deposed and subsequently assassinated by Jin. When Di and Qiang tribes subsequently revolted due to the treatment of their chiefs, Liu Cong sent Jin to suppress them, and Jin was successful. In fall 317, Liu Cong created Liu Can crown prince.