In Greek mythology, Zeus is the "Father of Gods and Men", the King of gods, who rules the Olympians atop Mount Olympus. He is also the god of thunder and ruler of the sky.
Cronos, his father, had sired six children with Rhea, his wife: Poseidon, Hades, Demeter, Hestia, Hera, and Zeus himself. But Cronos swallowed them all because of a prophecy claiming that he would be overthrowned by his son, as he had overthrown his own father. Rhea, seeking revenge, hid Zeus at birth and gave Cronos a rock wrapped in cloth to swallow instead.
Once he reached adulthood, Zeus set to fight his father. He made Cronos vomit the rock and his brothers and sisters, then he freed the Titans, the Hecatonchires, and the Cyclopes, which started a war known as the Titanomachy. Once victorious, Zeus casts his father and the other Titans to Tartarus, then divides the world between himself, Poseidon, and Hades. Zeus got the sky, Poseidon the sea, and Hades the Underworld.