Pergamon
Pergamon lies on the north edge of the Caicus plain in the historic region of Mysia in the northwest of Turkey. The Caicus river breaks through the surrounding mountains and hills at this point and flows in a wide arc to the southwest. At the foot of the mountain range to the north, between the rivers Selinus and Cetius, there is the massif of Pergamon which rises 335 metres above sea level. The site is only 26 km from the sea, but the Caicus plain is not open to the sea, since the way is blocked by the Karadağ massif. As a result, the area has a strongly inland character. In Hellenistic times, the town of Elaia at the mouth of the Caicus served as the port of Pergamon. The climate is Mediterranean with a dry period from May to August, as is common along the west coast of Asia Minor.
Pergamon
From the beginning of the reign of Philetairos, civic events in Pergamon were concentrated on the Acropolis. Over time the so-called 'Upper agora' was developed at the south end of this. In the reign of Attalos I, a Temple of Zeus was built there. To the north of this structure there was a multi-story building, which propbably had a function connected to the marketplace. With progressive development of the open space, these buildings were demolished, while the Upper Agora itself took on a more strongly commercial function, while still a special space as a result of the temple of Zeus. In the course of the expansion of the city under Eumenes, the commercial character of the Upper Agora was further developed. The key signs of this development are primarily the halls built under Eumenes II, whose back chambers were probably used for trade. In the west, the 'West Chamber' was built which might have served as a market administration building. After these renovations, the Upper Agora thus served as a centre for trade and spectacle in the city.