Datong is a prefecture-level city in northern Shanxi province, People's Republic of China, located a few hundred kilometres west by rail from Beijing with an elevation of 1,040 metres (3,410 ft). It has a population of 3,318,057 at the 2010 census of whom 1,447,150 live in the built up area made of 3 out of 4 urban districts, namely Chengqu, Kuangqu and Nanjiao. Near here was the Beidi kingdom of Tai which was conquered by the Zhou dynasty in 457BC. It bordered on the Hu nomads and traded in horses. Tai was later a commandery or county. The town was founded as Pngchng in 200 BC during the Han Dynasty, after the Battle of Baideng between the Han and the Xiongnu. Located near the Great Wall Pass to Inner Mongolia. It blossomed during the following period and became a stop-off point for Camel Caravans moving from China into Mongolia and beyond. It was sacked at the end of the Eastern Han Dynasty.
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