Why the Tang Dynasty was called Hu Tang again, this has to start from the rebellion of the Eight Kings of the Western Jin Dynasty. During the Western Jin Dynasty, the ethnic minorities in the north became increasingly powerful, and after the Rebellion of the Eight Kings, they invaded the Central Plains in one fell swoop, known in history as the Wuhu Chaohua. In addition to the southern crossing of some of the Shi clan, the remaining Han and various ethnic minorities have a complicated relationship, Xianbei, this powerful ethnic group in the north came from the Qinghai-Tibet Plateau nomadic, they should be the strongest ethnic group at that time, conquered the local Shi clan, some people stayed in the local area, combined with the local Shi clan, the Surname Li is one of the five major surnames of the Xianbei Sinicization of the Northern Wei Dynasty.
The unification of the Sui Dynasty was actually a great national integration, and at this time, most of the northern warriors had the blood of ethnic minorities. Tang Gaozu's birth mother and empress Li Yuan were both Xianbei people, so Tang Taizong Li Shimin's grandmother and birth mother were all pure-blooded Xianbei people. Looking at the people around Li Shimin, the eldest grandson Wuji, Wei Chi Jingde, Yu Wenshi, etc., are all Hu people. Li Shimin's main adviser Liu Wenjing was also a Xiongnu Hu.
From the history books, we know that the folk customs of the Sheng Tang Dynasty were very open-ended, which actually coincided with the customs of ethnic minorities and was very different from the traditional Confucian culture of the Han Family. At that time, women could even apply for peaceful divorce and remarry. In addition to the Xianbei blood of the Tang royal family, the main ministers of the Tang Dynasty were also Hu people, and 23 of the Tang Dynasty prime ministers were Xianbei people, so it is not difficult to understand why there are descendants who call Li Tang Hu Tang.