LEFT: Head of ZeusThe sky and thunder god in ancient Greek religion; who ruled as king of the gods of Mount Olympus.The head; dating to the first half of the 2nd century AD; is modeled on a Greek original of the late 5th or early 4th century BC.RIGHT: Bust of Pluto. God of the underworld.Fine-grained crystalline marble.The head; thought to be a Roman imperial copy of a Greek original of the second half of the 5th century BC; is inserted onto a 17th-century bust of nero antic marble.National Roman Museum - Palazzo Altemps; Rome; Italy.