The Xiadu or Lower Capital of Yan () was one of the capitals of Yan during the Warring States period of ancient China. Xiadu may have been the largest city in the world from 400 to 300 BC, with an estimated peak population over 300,000.
The Xiadu or Lower Capital of Yan () was one of the capitals of Yan during the Warring States period of ancient China. Xiadu may have been the largest city in the world from 400 to 300 BC, with an estimated peak population over 300,000.
The remains of the city are located in Yi County, Baoding, Hebei Province. At 30 km2, Xiadu is the largest excavated city from the Warring States period. Xiadu was surrounded by a moat and rammed earth wall; the base of the city walls measured 40 m at its widest. A portion of the old city wall, measuring up to 6.8 m high, still remains today. The ruins were first excavated in 1929 by an archaeological expedition from Peking University.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).