Located in the Inner Mongolia Autonomous Region in northwest China, the surrendered city was a military fortress built during the Tang Dynasty to defend against northern nomads. According to historical records, the surrendered city was originally built by Zhang Renyuan, a famous general of the Tang Dynasty, and later repaired and expanded many times, becoming a military town in the north of the Tang Dynasty.
Regarding the name of the surrendered city, according to the records of Yuanhe County and County, in the twentieth year of Zhenguan (646), Tang Taizong accepted the surrender of the Turkic leaders in Lingzhou, so it was named the surrendered city. It is also said that the name of the surrendered city comes from the northern nomadic chieftains who accepted the surrender in the area during the Tang Dynasty.
Historically, the surrendered city served as an important military buffer between the Tang Dynasty and the nomadic peoples of the north. During the Tang Dynasty, the surrendered city became a battlefield for the two sides to fight many times, and also witnessed the peaceful exchanges and exchanges between the two sides. During the period of Taizong of the Tang Dynasty, the surrendered city was one of the important places for the Tang Dynasty and the northern nomads, and it was also an important platform for cultural exchanges between the two sides.
In addition, the surrendered city was also of great significance in the Tang Dynasty's frontier governance and ethnic policy. The Tang Dynasty set up a special department in the surrendered city to manage frontier affairs, implement the policy of restraint, respect the customs and habits of local ethnic minorities, and promote local stability and development.
Today, the surrendered city has become a historical site, but its existence still bears witness to the history and culture of northern China during the Tang Dynasty. Through the study and protection of the surrendered cities, we can better understand the political, military, economic and cultural conditions of northern China during the Tang Dynasty, and can also better inherit and promote the history and culture of the Chinese nation.