Why is Baita Temple the witness of Tibet's return to the motherland?

There are Baita Temple in Miaoying, Baita Temple in Jizhou, Baita Temple in Funing County, Baita Temple in Zhongjiang, Baita Temple in Yongqing County (due to the reconstruction of stupa), Baita Temple in Lanzhou, Baita Temple in Yutai County, Baita Temple in Bagong Mountain in Huainan, etc. Therefore, Baita Temple is a multi-purpose word. When you say witness of Tibet's return to the motherland, you should mean Baita Temple in Liangzhou, Wuwei, Gansu. This temple is the earliest historical witness of Tibet's incorporation into Chinese territory. A historic meeting was held in Baita Temple in Liangzhou, 20 kilometers southeast of Wuwei City, Gansu Province. Pandita of Sakya Sect, a leader of Sakya Sect with a high position in Tibetan Buddhism, published the famous "Book of Pandita of Sakya Sect to Brahman" here after the talks in 1247. Since then, the central government of the Yuan Dynasty has officially exercised administrative jurisdiction over Tibet, and Tibet has been incorporated into Chinese territory. Baita Temple in Liangzhou, founded in Xixia, is the largest Tibetan Buddhist temple in ancient Gansu. Sakya sent Pandita to Baita Temple for five years, giving lectures and spreading Buddhism, and established close relations with local people of all ethnic groups. The religious leader died here in 125 1. Kuo Duan, the prince of the Mongolian khanate who met him, built a 42.7-meter-high spiritual bone tower in the form of a Tibetan stupa, surrounded by 99 small pagodas. 1927 An earthquake seriously damaged the Guling Tower, and the only existing Guling Tower is 8 meters high and 56 meters in circumference. Due to the extremely important historical value of Baita Temple in Liangzhou, all ethnic groups and circles in Gansu, Qinghai, Tibet, Inner Mongolia and other places generally demand that the temple restoration project be started as soon as possible. National Cultural Heritage Administration entrusted the Institute of Historical Architecture of China Institute of Building Technology to carefully plan and design the restoration of Baita Temple in Liangzhou. Fu Xinian, a famous architect, led experts and scholars to inspect Sakya Temple in Tibet and Baita Temple in Beijing respectively, and collected a lot of historical materials in an attempt to restore this temple with a history of more than 700 years.