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During the rule of Alexander III the Great (BC 336–323) and after his death, unified coins circulated all over the entire Hellenistic world. The silver tetradrachms have head of Heracles on their obverse. After the Alexander´s death and after the royal proclamation of some Diadochi, portraits of the particular living rulers started to appear on obverse of the subsequent coins. The tetradrachms of the rulers in the Kingdom of Pergamon represented an exception. The coins showed only dead rulers. But the unique tetradrachm with portrait of Eumenes II (alive in time of production) seems to be a special case in the mentioned system.

Portréty na mincích pergamských vládců / Portraits on coins of the rulers in Pergamon