What would be the most important commercial center of Ephesus, was built in the third century B.C., in the Hellenistic period, but the ruins date from the region of Caracalla, between the 211 and the 217.

It had the shape of a square, 110 meters on each side and surrounded by columns. The Agora had 3 doors, one in front of the theater, to the northeast, the other to the port, to the west and the third from the Library of Celsus side. Its northern part was open to the left, while the other three were surrounded by a portico, where rows of shops lie. At the core of Agora there were two, a sun and a water clocks.