The earliest settlements at Metropolis are from the Early Bronze Age (3000 B.C.) During the excavations carried out since 1989 on the acropolis, potsherds and stone axes of the period have been uncovered. A Hittite seal of the Late Bronze Age (12th century B.C.) at the acropolis is an important document of the settlement. The Ionian city of Metropolis was also founded on the hilltop after ca. 725 B.C.
Metropolis, meaning the city of the mother goddess, developed rapidly in the 3rd cent. B.C. Monumental buildings such as the stoa, theatre, bouleuterion and the temple of Ares were erected in this period.
The city retained its importance in the Roman Period. A bath gymnasium complex, several temples and richly decorated houses were built. Metropolis was a bishporic during the Byzantine Period. Due to wars and bad economy, the city diminished in size and a castle was built to protect the city. In the 14th century, the city was under the rule of the Emirate of Aydinogullari. In the Ottoman Period, the city was called Kizilhisar. Metropolis which is located in Torbali, was first identified by travellers in the 17th century.
During the excavations, the theatre, stoa, bouleuterion and Roman Bath and the reception hall ith its mosaic floors have been covered with provisional protective roofing.
We can surmise from the results of the excavations that the city made great progress in the Hellenistic age (2nd-1st cent. B.C.). Especially the sculpture discovered so far in the city bears witness to a high level of civilization, art and culture.
Metropolis entered a period of stagnation after Augustus. We know the existence of several temples and other buildings from the inscriptions. During the excavations at the stoa, an inscription on a column was found which shows that the practice of sponsorship goes back to antiquity. According to this inscription, parts of the buildings were financed by the citizens of the city.