Greece: The Greeks were polytheistic and believed in multiple gods and goddesses. The main gods/goddesses were Zeus, Hades, Poseidon, Hera, Athena, Ares, Aphrodite, Apollo, Artemis, Hephaestus, Demeter, Hestia and Dionysus. The myths about these gods were developed to teach many people about events that they did not understand, such as why the sun rises in the east and sets in the west