Historically, the myth of the Gigantomachy (as well as the Titanomachy) may reflect the "triumph" of the new imported gods of the invading Greek speaking peoples from the north (c. 2000 BC) over the old gods of the existing peoples of the Greek peninsula. For the Greeks, the Gigantomachy represented a victory for order over chaos—the victory of the divine order and rationalism of the Olympian gods over the discord and excessive violence of the earth-born chthonic Giants. More specifically, for sixth and fifth century BC Greeks, it represented a victory for civilization over barbarism, and as such was used by Phidias on the metopes of the Parthenon and the shield of "Athena Parthenos" to symbolize the victory of the Athenians over the Persians. Later the Attalids similarly used the Gigantomachy on the Pergamon Altar to symbolize their victory over the Galatians of Asia Minor.