Pergamon
Pergamon's other notable structure is the great temple of the Egyptian gods Isis and/or Serapis, known today as the "Red Basilica" (or "Kızıl Avlu" in Turkish), about south of the Acropolis at (39 7' 19" N, 27 11' 1" E). It consists of a main building and two round towers within an enormous "temenos" or sacred area. The temple towers flanking the main building had courtyards with pools used for ablutions at each end, flanked by stoas on three sides. The forecourt of the Temple of Isis/Sarapis is still supported by the Pergamon Bridge, the largest bridge substruction of antiquity.
Gongylos
It is thought that the Greek dynasts of Pergamon were punished following the Peace of Antalcidas in 386 BCE for their support of the Greeks against the Achaemenids. However, by the mid-4th century BCE, the Achaemenid satrap Orontes again allowed the people of Pergamon to settle on the acropolis of their city. This lasted until the conquests of Alexander the Great, when Pergamon became part of the Macedonian Empire.