There are twelve major gods in Greek mythology. Whenever the council of twelve met, they met on Mount Olympus. Except for Hades, who preferred his home in the underworld, the twelve Olympians also kept their homes on Mount Olympus.

Greek mythology is not really clear whether or not Mount Olympus was a place on earth or in the heavens. But the Greeks did name the tallest mountain peak Mount Olympus. 

Here are the twelve Olympians, the 12 major gods: