Throughout history, we can find that in ancient times, the dynasties dominated by the Han nationality basically used the way of harmony to marry neighboring countries when they were weak, but few ancients were willing to marry foreign women, especially the Xiongnu, so why is this?
Many people are thinking that it is not because of the poor and backward reasons of the Xiongnu, in fact, this is only a part, the most important thing is that the Xiongnu have a custom, the Central Plains people are not willing to find a Xiongnu as a wife, first of all, because in the eyes of the ancients at that time, the Xiongnu always fought, giving people the impression of barbarians, so even if there are good-looking Xiongnu girls, there will be few Central Plains men willing to marry.
The second is that the Han people do not despise the marriage system of the Huns, although in ancient China can be polygamous, but there will be no case of fathers and sons and brothers marrying a wife, and in the Xiongnu is the adoption of the succession system, the father died the son can inherit the father's wife, this bad habit in the eyes of the ancient Han people in China, is simply barbaric behavior.
The appearance of a Wu Zetian in the Tang Dynasty was already a stain on Li Zhi's life, but in the Xiongnu everyone did this, so of course, no Han family let the gentle and kind Han women not run to marry Xiongnu women.