During the Tang Dynasty, countries came to Korea to reach its peak, with as many as 300 countries paying tribute. Its territory is unprecedented. At the peak, it started from the Sea of Japan in the east, occupied by Annan in the south, reached the Aral Sea in the west and reached Lake Baikal in the north. It is the first unified dynasty in China that has not been occupied by Hu Changcheng since Qin Dynasty.
After the Tang Dynasty conquered East Turkistan and Xue Yantuo, Emperor Tiandi was honored as Tiankhan by the four clans, and used the imprisonment system to recruit Turkic, Uighur, Tiele, Qidan, Mohong, Shiwei and other vassal states to attack the enemy, so that Japan, Nanzhao, Silla and Bohai could learn their own culture and system.
Extended data
territorial scope
In its heyday, the territory of the Tang Dynasty started from the Korean Peninsula in the east, to Hue in Vietnam in the south, to the Aral Sea and Khorasan in Central Asia in the west, and to the lower reaches of the Yenisei River in the north.
There were many ethnic minorities in the Tang Dynasty. In order to effectively manage the Turkic, Uighur, Tiele, Shiwei, Qidan, Mohong and other ethnic groups, six capitals, including Anxi, Anbei, Anton, Annan, Chanyu and Beiting, as well as a large number of counties and counties and Jimi States subordinate to the six capitals, have been established respectively.
However, in the decades after the Anshi Rebellion, because a large number of border guards in Helong participated in the rebellion, the border defense was empty, and the Tubo took advantage of the situation to occupy the areas of Helong and Huangshui, while the Hetao area was still under the jurisdiction of the German army and Zhenwu army. During the period from Dazhong to Xian Tong in the late Tang Dynasty, Zhang Yichao, a native of Shazhou, set out to recover the Helong area and reopen the Silk Road. Xian Tong defeated Tubo in seven years and split into 100 tribes.
Baidu Encyclopedia-Tang Dynasty