The same central group of Zeus, Athena, Heracles and Gaia, found on many early Attic vases, also featured prominently on the Pergamon Altar. On the right side of the East frieze, the first encountered by a visitor, a winged Giant, usually identified as Alcyoneus, fights Athena. Below and to the right of Athena, Gaia rises from the ground, touching Athena's robe in supplication. Flying above Gaia, a winged Nike crowns the victorious Athena. To the left of this grouping a snake-legged Porphyrion battles Zeus and to the left of Zeus is Heracles.