List the historical facts of friendly exchanges between Tang and Tubo.

1, Princess Wencheng married Songzan Gambu.

2. Establishment of the relationship between nephew and uncle. Princess Wencheng entered the country, and the Tang Dynasty sent Shang Shu and Li Daozong, King of Jiangxia, as special envoys to escort her. Tubo Zanpu Songzanganbu met his son-in-law in Bohai Sea at the source of the Yellow River. Later, Zanpu called himself the nephew of the Tang Emperor, and this relationship was further strengthened by Princess Jincheng's re-entry into Tibet. The so-called "Prince Eiko is a son-in-law, and Uncle Han is kind" has been circulated as a beautiful talk in history.

3. Establishment of grant relationship. In 6× 49 AD, Tang Gaozong Li Zhi acceded to the throne, conferring Songzan Qianbu as the surname (official position) and King of Xihai County (title). He wrote to Sun Chang Wuji, the prime minister of the Tang Dynasty, saying, "When the Emperor first ascended the throne, there were disloyal people under him. He is willing to send troops to the countryside to beg. " 15 kinds of Zhao mausoleum of Emperor Taizong were named Jin Xuan. The Tang Dynasty also made him king (or guest and host), and carved him in Zhaoling along with the stone statues of 13 other minority princes. After a long time, Zamp must tell Tang his condolences after his death. New firm Ba must be registered in the Tang Dynasty to be legal.

4. Sino-Tibetan cultural exchange and the formation of Tubo culture. Tubo introduced Buddhist culture from Niboro and Tang Dynasty, and Han culture from Tang Dynasty, which are the two major origins of Tubo culture.