원제
As Crown Prince Ao grew older, Emperor Yuan became increasingly unhappy with Ao's fitness as imperial heir and increasingly impressed with Consort Fu's son, Prince Kang of Dingtao (). Several incidents led to this situation. One incident happened in 35 BC, when Emperor Yuan's youngest brother Prince Liu Jing of Zhongshan () died. Emperor Yuan became angry when he felt that the teenage Crown Prince Ao was insufficiently grieving—particularly because Princes Ao and Jing were of similar age and grew up together as playmates—and was showing insufficient respect towards Prince Jing. Prince Ao's head of household Shi Dan (), a relative of Emperor Yuan's grandmother and a senior official respected by Emperor Yuan, managed to convince Emperor Yuan that Crown Prince Ao was trying to stop Emperor Yuan himself from grieving too much, but the seed of dissatisfaction was sown.