Ancient stele in Istanbul Archaeology Museum : Athena to the left is attacking two giants who try to flee, which is a bit difficult with their serpent's legs. Both wear lion pelts, the one to the right tries to protect himself with it. Roman, 2nd century BC from Aphrodisias . Gigantomachy was the symbolic struggle between the cosmic order of the Olympians led by Zeus and the nether forces of Chaos led by the giant Alcyoneus in Greek mythology. Heracles fought on the side of Olympians, who defeated the Giants in accordance with Hera's prophecy that the gods' victory would not be accomplished without the participation of the son of a mortal mother.