The history of Gyeongsan dates back to ancient times, long before the Common Era. During the period of the Jinhan tribal confederacy, a proto-state named Apdok-guk existed on its modern territory. This was one of the small entities that later became part of the powerful Silla Kingdom. After joining Silla—a pivotal moment in the region's history—the area was granted county (gun) status and became known as Apryang-gun. This period laid the foundation for Gyeongsan's further development as an administrative and cultural unit.
Geographical location played a decisive role in Gyeongsan's formation. The city is situated at the intersection of important trade routes connecting major centers in the southeast of the Korean Peninsula. Its proximity to the Silla capital, Gyeongju, as well as to the modern metropolis of Daegu, fostered its economic and political growth. Throughout the centuries, during the Goryeo (918–1392) and Joseon (1392–1897) dynasties, Gyeongsan maintained its importance as a vital administrative and agricultural center, changing names but never losing its role in regional life.
Since ancient times, Gyeongsan's economy has been closely tied to agriculture and crafts. The region was famous for its fertile lands, which contributed to its prosperity. The city's cultural heritage is inextricably linked with the Silla era, as evidenced by numerous archaeological finds and historical monuments. In the city's outskirts, one can still find noble tombs, the ruins of ancient military outposts, and Buddhist temples that serve as silent witnesses to the rich history and cultural influence of the Silla Kingdom. These artifacts show that Gyeongsan was not only a trading hub but also a significant cultural center of its time.