THE GREEK MYTHOLOGY

In the Greek mythology, the Olympian(Olympic) gods were the principal gods of the Greek pantheon, who were dwelling in the top of the mount Olympus, the highest of Greece. There were, in different epochs, fourteen different gods recognized like Olympian(Olympic), though nevermore of twelve simultaneously. Of there that sometimes one refers to them as the twelve Olympian(Olympic) ones.
The assistants of the Olympian(Olympic) gods, detail of a bas-relief, Greek sarchofagus, c. 240 B.C. (Museum of the Louvre)
Zeus, Hera, Poseidon, Plough, Hermes, Hefesto, Aphrodite, Atenea, Apollo and Artemisa they are considered to be always Olympian(Olympic) gods. Hestia, Deméter, Dioniso and Hades are the changeable gods who were completing the dozen.