"No filial piety has three, no queen is greater", marriage and children in ancient times, is an absolute major event. However, for the matter of marriage, in ancient times, China strictly prohibited intermarriage with the same surname. This is also the reason for the appearance of surnames, which represent a family of the same bloodline.
The ancients said that "men and women with the same surname, their birth is not fertile", which means that people with the same surname will not flourish if they marry their children and grandchildren. This is a sentence summed up by the ancients based on experience, in fact, even if it is put into the present, it still has great scientific significance. Because the marriage of two people with the same surname will have an impact on the health of future generations.
But such a conclusion also has certain limitations of the times. At the time of this theory, people with the same surname were generally handed down from the same clan. However, after more than 5,000 years of development, there have been many changes to surnames.
This has a result, sometimes two surnames of people, in fact, there is no connection at all. Even if some surnames are changed from foreigners or ethnic minorities in the past, and people of two clans marry each other, there must be no problem.
Therefore, modern marriage law only prohibits "direct blood relatives and collateral blood relatives within three generations" from intermarriage, and if it is two very distant people with the same surname, it is no problem at all. And now there are many such couples, and their offspring are also very healthy.
Since the ancients forbade marriage with the same surname, why did they advocate the marriage of close relatives? This is mainly for marriage, for the sake of kissing and kissing. For example, in the dream of the Red Chamber, Jia Baoyu actually belongs to the relationship between Lin Daiyu and Xue Baochao, whether it is with Lin Daiyu or Xue Baochao.
However, when the people of the Jia family chose a spouse for Jia Baoyu, they concentrated on the two girls Lin Daiyu and Xue Baochao. This is actually for marriage, a union of two major forces. Whether it was the Lin family or the Xue family, they were all big families at that time. However, because Lin Daiyu's father died too early, he had no influence, resulting in the failure of Lin Daiyu's marriage.
Such examples are not uncommon in history, such as Wang Zhaojun, who first married Hu Han evil Shan Yu. Later, Hu Han died not long after, and Wang Zhaojun could only remarry his son Fu Zhu Lian Yu.
Fu Zhu Li Died Not long after, Wang Zhaojun could only marry Shan Yu of his grandson. Wang Zhaojun finally died of poisoning, and her tragedy was because of her peace.
In order to enhance his own strength, Lü Yan asked Liu Ying to marry his niece, who was only ten years old, which was also for marriage. The three loyal ladies of the Ming Dynasty married their grandfathers, uncles and cousins respectively. He also did so for the integrity of the Mongol forces at the time.
However, the result of the marriage of close relatives is also very serious, although there is nothing wrong with the children born in the second generation, but they respond to the words of the ancients, and their descendants do not flourish. For this problem, in fact, at the end of many dynasties, such problems often occur.
That is, the emperor had no sons, and could only inherit one from the same sect. Puyi of the Qing Dynasty and Wanli of the Ming Dynasty all became emperors in this way.
On the contrary, the two emperors of Qianlong Kangxi, many of their concubines were found in the people, and even some were just rural village girls. These girls have no half-cent relationship with the royal family, so the children of these emperors will also be more, and the descendants will be more prosperous.
Reference: Dream of the Red Chamber
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