Yan (state)

ancient state in northern China during the Shang, Zhou, and Warring States periods (11th century BC – 222 BC)

ancient state in northeastern China under the Shang and Zhou

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.

capital of the ancient Chinese states of Ji and Yan, an imperial Chinese district capital, and a capital of the Liao and Jurchen Jin Empires

11th-century BC conflict

archaeological site, History museum in Beijing