Emperor Yuan
As Crown Prince Ao grew older, Emperor Yuan became increasingly unhappy with his fitness as imperial heir and impressed with Consort Fu's son, Prince Kang. Several incidents led to this situation. One happened in 35 BC, when Emperor Yuan's youngest brother Prince Liu Jing of Zhongshan (中山王劉竟) 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 showing insufficient respect to Prince Jing. Prince Ao's head of household Shi Dan (史丹), 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 over-grieving, but the seed of dissatisfaction was sown.