Described as a wealthy and prosperous seaport at the mouth of the Cayster River, Ephesus was the largest city of the Roman province of Asia with a population of perhaps 300,000.
The city had a large theater which held about 24,500. Other important buildings were the agora or marketplace, library, baths, gymnasium and burial monuments. It was the center of the mother goddess worship of Artemis (Greek) or Diana (Roman) and the site of the great temple of Diana, one of the seven wonders of the ancient world.
Paul visited this city at the end of his second journey and spent three years here during his third journey (Acts 18:19-21)