What is the name of Datong in the Tang Dynasty? What are the place names of the ancient Tang Dynasty?

In 589 AD, Emperor Wendi of Sui Dynasty unified China, ending nearly 300 years of north-south division. Because Wendi's father is famous for his loyalty, he avoided the word "loyalty" and changed Yunzhong County to Yunnei County. Datong is still called Heng 'an Town, which belongs to Mayi County. In 6 18, the Tang dynasty was established. In the sixth year of Tang Gaozu Li Yuan Wude (AD 623), Beihengzhou was established here. In the fourteenth year of Zhenguan (AD 640), it was renamed Dingxiang County, and it was also ruled by Yunzhou, which was abolished in the early years of Yongchun. In the 18th year of Kaiyuan (AD 730), it was called Yunzhong County and Yunzhou.