The Pergamon Altar is a monumental construction built during the reign of King Eumenes II in the first half of the 2nd century BC on one of the terraces of the acropolis of the ancient city of Pergamon in Asia Minor. The structure is 35.64 meters wide and 33.4 meters deep; the front stairway alone is almost 20 meters wide. The base is decorated with a frieze in high relief showing the battle between the Giants and the Olympian gods known as the Gigantomachy.
There is a second, smaller and less well-preserved high relief frieze on the inner court walls which surround the actual fire altar on the upper level of the structure at the top of the stairs. In a set of consecutive scenes, it depicts events from the life of Telephus, legendary founder of the city of Pergamon and son of the hero Heracles and Auge, one of Tegean king Aleus's daughters.