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.
Pergamon
With the expansion of the Anatolian beyliks, Pergamon was absorbed into the beylik of Karasids shortly after 1300, and then conquered by the Ottoman beylik. The Ottoman Sultan Murad III had two large alabaster urns transported from the ruins of Pergamon and placed on two sides of the nave in the Hagia Sophia in Istanbul.