I won't search the internet for answers. Just use my own knowledge to talk about it. Tubo, a political power established by ancient Tibetans in the 7th-9th century, is an ancient kingdom located on the Qinghai-Tibet Plateau, which lasted for more than 200 years from Songtsan Gambo to Mill, and was the first political power established in Tibetan history. So there was no Tubo in the Han Dynasty. The relationship between China and Tubo can only begin from the Tang Dynasty. The primitive inhabitants of the Qinghai-Tibet Plateau are called Mongolians. After the Warring States Period, some Qiang tribes, such as Faqiang and Tommy, gradually migrated to Tibet today. They merged with the local people, multiplied and developed, and formed the Tubo people. So now Tibetans and Han people are genetically the same ancestor. The Tubo Dynasty was founded by the Yak tribe living in the Yalong River valley, and the unity of the tribes in the Yak tribe was called Abandoning Nie and Zanpu. "Zanpu" means a strong husband, and later became the honorific title of the Tubo monarch. From the beginning of abandoning Nie, Tubo established the hereditary system of Tusi. After the eighth praise of Bubugai Gongjia, the Tubo society developed rapidly, and gradually transitioned from primitive society to slave society. After Songzan Gambu, Tubo and Tang Dynasty launched fierce competition. In 670, Tubo destroyed Tuyuhun and invaded the Western Regions. In 675, the Tang Dynasty took control of the Western Regions, and in 687 -689, Tubo occupied the Western Regions again. In 692, Wang Xiaojie, general manager of Wuwei Army, destroyed Tubo, recovered the Western Regions, moved the capital to Kikucha, Anxi, and stationed 30,000 troops in the Tang Dynasty. The Tang Dynasty controlled Anxi Beiting in Longyou, Hexi for a long time. The rebellion of Anshi and the chaos of the tyrants, the disaster of the buffer region, the change of the Niuli Party fighting for nectar, the constant infighting in the Tang Dynasty, and its own serious weakness. Tubo took the opportunity to expand. 790 years later, the Tang Dynasty lost Anxi North Court. Around 85 1, Zhang Yichao of the Tang Dynasty reoccupied the Hexi Beiting in Longyou. Princess Wencheng and Princess Jincheng married Tubo Zampa when the Tang Dynasty was in the ascendant. In the battle of Songzhou, Tang Jun defeated the Tubo army, Songzan Gambu withdrew his troops to apologize, Tubo withdrew from Tangut and Bai Lanqiang, and Tuguhun of Qinghai became a vassal of the Tang Dynasty. The Tang Dynasty controlled Longyou in Hexi for a long time and gradually controlled the western regions (Anxi Beiting). Tubo Songzan Gambo accepted the knighthood of the Tang Dynasty, and the Tang Dynasty had an advantage over Tubo, which made Princess Wencheng have a high position in Tubo.

Tang Xiujing and Chen Daci led Tang Jun to defeat the Tubo army. The Tang Dynasty controlled Longxi Longyou in Anxi Beiting for a long time, and Princess Jincheng married Tubo Sambo. The Tang Dynasty also had advantages over Tubo, which made Princess Jincheng have a high position in Tubo.

There are few absurd elements in some Tubo historical materials, such as Bhrikuti Devi of Nipolo, Tubo documents in Dunhuang, and Tubo inscriptions, as well as records in Chinese historical materials. There are all Songzan Gambu marrying Princess Wencheng, but there are no Songzan Gambu marrying Nipolo. The marriage between Songtsan Gampo and Nibo Bhrikuti Devi only comes from some chapters in some Tubo classics full of fantastic and absurd stories (such as History among Columns (Guanyin in Tibet), History of Tibetan Kings, etc.). In fact, the status of Nirvana Bhrikuti Devi is relatively low. There is even a foreign Tibetan scholar who wrote about Songzan Gambu's wife, saying that the marriage between Songzan Gambu and Nipolo Bhrikuti Devi is fictitious.

With the increasingly close relationship between Tang and Fan, a large number of Han Chinese entered Tibet, and some children of Tubo nobles also entered schools in Chang 'an to study Chinese culture. The two sides exchanged ambassadors on the road to carry out activities such as shura, tribute, celebration and accession. The input of Chinese culture has played a great role in promoting Tibetan society, and Tibetan culture also has a certain influence on the Han nationality. At that time, Tibetan horses, beautiful and exotic gold and silver wares and other items were continuously spread to the mainland, and even the custom of making noodles in Tibet was imitated by Han women. Close economic and cultural relations have deepened the friendship between the two sides. In 729 (the seventeenth year of Kaiyuan), Zanpu, who abandoned his official position, said to Emperor Xuanzong of Tang Dynasty: "My nephew was an uncle of the first emperor and was knighted as Princess Jincheng, so he became a family and everyone in the world was happy." (Biography of Tubo in the Old Tang Dynasty) shows that the relationship between Han and Tibet in the Tang Dynasty is inseparable. Frequent wars weakened the national strength of the Tubo, and Gao and Shi Jingfeng of the Tang Dynasty attacked the Tubo army many times. After entering the 9th century, Tubo began to decline from prosperity, and could no longer expand outward. In 82 1 year (the first year of Changqing), Tubo Crick sent a special envoy to the Tang Dynasty to request an alliance and conclude a friendly covenant. The grand joining ceremony was held in Chang 'an and Luodian, Tang Dou, and the group article emphasized that we should always be friendly. In 823, the Tang-Fan Alliance Monument established in Lhasa still stands in front of Jokhang Temple, which has become a precious material evidence of friendship and unity between the Han and Tibetan nationalities.

After the end of the 8th century, the internal contradictions of the Tubo ruling class intensified day by day. Competition within the royal family divided Tubo. There was another scuffle between the Tubo generals, which brought even greater disaster to the people. In 848, Zhang Yichao, a native of Shazhou (Dunhuang, Gansu), launched an uprising. The Tang people responded and quickly occupied Shazhou. Then, Zhang Yichao sent troops to capture the ten states of Gua, Yi, Gan, Su, Lan, Shan, He, Min and Kuo (the above areas are in Gansu, Xinjiang and Qinghai). In 85 1 year (the fifth year of Dazhong), Zhang Yichao sent his younger brother Zhang to the DPRK with maps of 11 states, such as Fengsha and Gua, and returned to the rebel army in Shazhou, with Zhang Yichao as our time, and Helong area was once again controlled by the Tang Dynasty.

In short: the rise of Tubo will not last long. Without advanced civilization as the driving force, it will be assimilated by the Han nationality sooner or later, and the harsh living environment will not produce rich products. In addition, due to Buddhist beliefs, Tibetans live a kind and happy life. Today's Tibet is a natural barrier against China, and an iron gate to defend the territory of the Han nationality. In ancient times, if the Tubo people didn't adapt to the low-altitude climate, it is estimated that they would leave a strong legacy in the Central Plains, and their ability to fight alone was always strong. Almost marginalized since the Tang Dynasty.