Liu Cong
In spring 312, Empress Huyan died. In less than a month, Liu Cong began to take a large number of his high-level officials' daughters and granddaughters as concubines, including a number of them with the family name Liu—daughters and granddaughters of his official Liu Yin (劉殷) -- which Crown Prince Ai opposed due to the general prohibition against endogamy. However, Liu Cong rationalized that these Liu women were ethnically Han, and he himself was ethnically Xiongnu, and therefore could not have come from the same ancestry. From this point on, Liu Cong was said to have been spending all his time with these women and rarely spent time to handle government matters.