The Pergamon Altar was a monumental construction built during the reign of the Ancient Greek King Eumenes II in the first half of the 2nd century BC on one of the terraces of the acropolis of Pergamon in Asia Minor.

Pergamon or Pergamum, also referred to by its modern Greek form Pergamos (Πέργαμος), was a rich and powerful ancient Greek city in Mysia. It is located 26 kilometres (16 mi) from the modern coastline of the Aegean Sea on a promontory on the north side of the river Caicus and northwest of the modern city of Bergama, Turkey.