Greek Mythology, Core DietiesOlympian Gods The principal deities, six gods and six goddesses, lived on Mount Olympus, the highest peak in Greece. Zeus (pronounced ZOOS; called Jupiter by the Romans) was the king of the gods and reigned over all the other deities and their realms. He was the protector of justice, kingship, authority, and the social order. His personal life was rather disorderly, however. Many myths tell of his love affairs with various goddesses, Titans, and human women—and their effects.