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Stoa of Attalos Lining the east side of the Agora square is the Stoa of Attalos (Fig. 47), built during the reign of Attalos II of Pergamon (159–138 B.C.), who studied in Athens under the philosopher Karneades ... Pergamon (159–138 B.C.), who ... of an unusual type ... of Attalos, 159–138 B