The territory of the Tang Dynasty was unprecedented. At its peak, its territory started from the Sea of Japan in the east, occupied by Annan in the south, the Aral Sea in the west and Lake Baikal in the north. It is the first unified dynasty in China since the Qin Dynasty that did not build the Great Wall of Hu.
After the Tang Dynasty conquered East Turkistan and Xue Yantuo, Emperor Tiandi was honored as Tiankhan by the four clans, and used the imprisonment system to recruit Turkic, Uighur, Tiele, Qidan, Mohong, Shiwei and other vassal states to attack the enemy, so that Japan, Nanzhao, Silla and Bohai could learn their own culture and system.
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As a royal family, Li Group is a family with Xianbei descent. Li, a native of big noble, was highly regarded in the Northern Zhou Dynasty and Sui Dynasty. For example, Tang gaozu's father thought that Li Hu was in power at the beginning of the establishment of the Northern Zhou Dynasty, and even in the "movement" to restore the old Xianbei surname in Yu Wentai, he was given a Xianbei surname, Xiao Ye, and became a trustworthy aristocrat in the Northern Zhou Dynasty.
Of course, there is nothing wrong with this surname. Even reading Li Hu's name is a joke. This seemingly suitable name for living in a wildlife sanctuary does not mean that Li's ancestors were Xianbei people or non-Han people. However, it is an unchangeable fact that his wife Dugu (Dugu is a Han nationality), Li Yuan's wife Dou and his wife Shi are all conference semifinals.
In this way, the Li family, who entered the Central Plains, naturally had a different view of conference semifinals from other dynasties. Of course, the Li family is indeed 100% Han Chinese, and the Tang Dynasty is also the Han Dynasty, only changing the attitude of those in power.
Baidu Encyclopedia-Ethnic Policies in Tang Dynasty
Baidu Encyclopedia-Tang Dynasty (Chinese historical dynasty)