Greek mythology developed to explain natural phenomena and the origins of man. The Greeks believed in many gods and goddesses who lived on Mount Olympus and interacted with humans. According to myth, first there was Chaos, then Gaia and Uranus, who had Titans like Cronus who overthrew his father Uranus. Cronus' son Zeus later overthrew Cronus and became king of the gods. Zeus and the other Olympians, including Poseidon, Hades, and others, ruled from Mount Olympus. Myths often featured heroes who went on quests and proved themselves through adventures.