This document provides an overview of Greek and Roman mythology, summarizing the origins and major gods and goddesses. It begins with explanations of what myths are and the early creation myths, including the births of Gaia, Uranus, and their Titan offspring. It then summarizes the later overthrow of the Titans by Zeus and the other Olympians. The rest of the document profiles the most important Olympian gods like Zeus, Hera, Poseidon, and others, as well as other mythological figures like the Muses, Fates, and monsters.