The complete A-Z index of Greek Gods, Goddesses, spirits, demons, legendary monsters and other characters names from Greek mythology in alphabetical. Gods and Goddesses of Greek and Roman Mythology. Part of Mythology For Dummies Cheat Sheet. The predominant mythologies handed down through the. The Olympian gods were the main gods of Ancient Greece. After overthrowing their ancestors, the Titans, the Olympian gods became the rulers of the World.