Eumenes II built a huge marble altar to the god Zeus to celebrate his defeat of the Gauls. The remains of it have been unearthed and show that it was decorated with an enormous relief depicting gods battling giants. (PICTURE, Vol. 2, p. 945)

Legend said that from the hill where Pergamum was built certain gods had witnessed the birth of Zeus, and the immense altar later located on the acropolis is considered one of the marvels of the age.