In the beginning, Uranus (the sky) and Gaia (the Earth) appeared out of nothingness. They had children, the Titans. But Uranus was evil, and the Titans rebelled against him. Cronos was the boldest one; he overthrew his father and gained dominion over the cosmos. His wife Rhea bore him children, so Cronos would swallow the babies, for fear that if they grew up they would overthrow him the way he overthrew his own father. Thus, he swallowed Poseidon, Hades, Hera, Demeter and Hestia. Gaia and Rhea hid the 6th baby, Zeus; and indeed, Zeus grew up and overthrew Cronos! He freed his brothers and sisters from the belly of his father, and together they defeated the Titans. Then they took up residence on Mount Olympus, a real mountain which towers over Greece.