Greek Mythology of Greek Heroes, Olympian Gods, Trojan War, and Famous Myths. Greek legends are the body of legends and teachings held by the Greeks, their gods and their heroes, the nature of the world, the origin and importance of their own worship and their ritual practices. It was part of religion in ancient Greece. Scientists refer to myths and study them in an attempt to explain the religious and political institutions of ancient Greece and its civilization, and understand the nature of t