Origins and Founding
The history of Haicheng is rooted in deep antiquity, dating back to when the banks of the Liao River were first being settled. While the earliest traces of human presence in the area date back to the Paleolithic era, the region emerged as a significant political entity during the Warring States period (475–221 BC) as part of the ancient state of Yan. Located on the periphery of modern-day China, these lands always served as a vital buffer between the nomadic tribes of the north and the agricultural civilizations of the plains.
In the early Middle Ages (4th–7th centuries AD), the strategic importance of the region was recognized by the proto-Korean state of Goguryeo, which erected a powerful military fortress here. Later, during the eastward expansion of the Tang Empire, the territory was brought back under Chinese control. Haicheng received its poetic name, which means "City by the Sea," during the Khitan Liao dynasty (10th–12th centuries). In those days, the coast of the Bohai Gulf was much closer to the city walls than it is today, as silt deposits from the Liao River have since pushed the shoreline many kilometers away.
Haicheng officially received county status in 1653 under the Manchu Qing dynasty. The city's economic foundation was built on a combination of fertile agriculture—specifically rice and cotton cultivation—and rich mineral resources. The extraction of iron ore and coal at the foot of the Qianshan mountains predetermined the region's future development as a major industrial center of Liaoning province.