Greek mythology is known today primarily from Greek literature and representations on visual media dating from the Geometric period from c. 900 BC to c. 800 BC onward. In fact, literary and archaeological sources integrate, sometimes mutually supportive and sometimes in conflict; however, in many cases, the existence of this corpus of data is an indication that many elements of Greek mythology have strong factual and historical roots.
Mythical narration plays an important role in nearly every genre of Greek literature. Nevertheless, the only general mythographical handbook to survive from Greek antiquity was the Library of Pseudo-Apollodorus. This work attempts to reconcile the contradictory tales of the poets and provides a grand summary of traditional Greek mythology and heroic legends. Apollodorus of Athens lived from c. 180 BC to c. 125 BC and wrote on many of these topics. His writings may have formed the basis for the collection; however, the "Library" discusses events that occurred long after his death, hence the name Pseudo-Apollodorus.

Among the earliest literary sources are Homer's two epic poems, the Iliad and the Odyssey. Other poets completed the Epic Cycle, but these later and lesser poems now are lost almost entirely. Despite their traditional name, the Homeric Hymns have no direct connection with Homer. The oldest are choral hymns from the earlier part of the so-called Lyric age. Hesiod, a possible contemporary with Homer, offers in his Theogony (Origin of the Gods) the fullest account of the earliest Greek myths, dealing with the creation of the world, the origin of the gods, Titans, and Giants, as well as elaborate genealogies, folktales, and aetiological myths. Hesiod's Works and Days, a didactic poem about farming life, also includes the myths of Prometheus, Pandora, and the Five Ages. The poet advises on the best way to succeed in a dangerous world, rendered yet more dangerous by its gods.

Lyrical poets often took their subjects from myth, but their treatment became gradually less narrative and more allusive. Greek lyric poets, including Pindar, Bacchylides and Simonides, and bucolic poets such as Theocritus and Bion, relate individual mythological incidents. Additionally, myth was central to classical Athenian drama. The tragic playwrights Aeschylus, Sophocles, and Euripides took most of their plots from myths of the age of heroes and the Trojan War. Many of the great tragic stories (e.g. Agamemnon and his children, Oedipus, Jason, Medea, etc.) took on their classic form in these tragedies. The comic playwright Aristophanes also used myths, in The Birds and The Frogs.

Historians Herodotus and Diodorus Siculus, and geographers Pausanias and Strabo, who traveled throughout the Greek world and noted the stories they heard, supplied numerous local myths and legends, often giving little-known alternative versions. Herodotus in particular, searched the various traditions he encountered and found the historical or mythological roots in the confrontation between Greece and the East. Herodotus attempted to reconcile origins and the blending of differing cultural concepts.

The poetry of the Hellenistic and Roman ages was primarily composed as a literary rather than cultic exercise. Nevertheless, it contains many important details that would otherwise be lost. This category includes the works of:
199 The Roman poets Ovid, Statius, Valerius Flaccus, Seneca and Virgil with Serv…

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Mythology was at the heart of everyday life in Ancient Greece. Greeks regarded mythology as a part of their history. They used myth to explain natural phenomena, cultural variations, traditional enmities, and friendships. It was a source of pride to be able to trace the descent of one's leaders from a mythological hero or a god. Few ever doubted that there was truth behind the account of the Trojan War in the Iliad and Odyssey. According to Victor Davis Hanson, a military historian, columnist, political essayist, and former classics professor, and John Heath, a classics professor, the profound knowledge of the Homeric epos was deemed by the Greeks the basis of their acculturation. Homer was the "education of Greece" (Ἑλλάδος παίδευσις), and his poetry "the Book".
After the rise of philosophy, history, prose and rationalism in the late 5th century BC, the role of myth became less certain, and mythological genealogies gave place to a conception of history which tried to exclude the supernatural (such as the Thucydidean history). While poets and dramatists were reworking the myths, Greek historians and philosophers were beginning to criticize them.

By the sixth century BC, a few radical philosophers were already beginning to label the poets' tales as blasphemous lies: Xenophanes of Colophon complained that Homer and Hesiod attributed to the gods "all that is shameful and disgraceful among men; they steal, commit adultery, and deceive one another." This line of thought found its most sweeping expression in Plato's Republic and Laws. Plato created his own allegorical myths (such as the vision of Er in the Republic), attacked the traditional tales of the gods' tricks, thefts, and adulteries as immoral, and objected to their central role in literature. Plato's criticism was the first serious challenge to the Homeric mythological tradition; he referred to the myths as "old wives' chatter." For his part, Aristotle criticized the pre-Socratic quasi-mythical philosophical approach and underscored that "Hesiod and the theological writers were concerned only with what seemed plausible to themselves, and had no respect for us ... But it is not worth taking seriously writers who show off in the mythical style; as for those who do proceed by proving their assertions, we must cross-examine them."

Nevertheless, even Plato did not manage to wean himself and his society from the influence of myth; his own characterization of Socrates is based on the traditional Homeric and tragic patterns, used by the philosopher to praise the righteous life of his teacher:

But perhaps someone might say: "Are you then not ashamed, Socrates, of having followed such a pursuit, that you are now in danger of being put to death as a result?" But I should make t…

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The genesis of modern understanding of Greek mythology is regarded by some scholars as a double reaction at the end of the eighteenth century against "the traditional attitude of Christian animosity", in which the Christian reinterpretation of myth as a "lie" or fable had been retained. In Germany, by about 1795, there was a growing interest in Homer and Greek mythology. In Göttingen, Johann Matthias Gesner began to revive Greek studies, while his successor, Christian Gottlob Heyne, worked with Johann Joachim Winckelmann, and laid the foundations for mythological research both in Germany and elsewhere. About 100 years later the interest for Greek mythology was still alive when Hermann Steuding published his book Griechische und römische Götter- und Heldensage in 1897.
The development of comparative philology in the 19th century, together with ethnological discoveries in the 20th century, established the science of myth. Since the Romantics, all study of myth has been comparative. Wilhelm Mannhardt, James Frazer, and Stith Thompson employed the comparative approach to collect and classify the themes of folklore and mythology. In 1871 Edward Burnett Tylor published his Primitive Culture, in which he applied the comparative method and tried to explain the origin and evolution of religion. Tylor's procedure of drawing together material culture, ritual and myth of widely separated cultures influenced both Carl Jung and Joseph Campbell. Max Müller applied the new science of comparative mythology to the study of myth, in which he detected the distorted remains of Aryan nature worship. Bronisław Malinowski emphasized the ways myth fulfills common social functions. Claude Lévi-Strauss and other structuralists have compared the formal relations and patterns in myths throughout the world.

Sigmund Freud introduced a transhistorical and biological conception of man and a view of myth as an expression of repressed ideas. Dream interpretation is the basis of Freudian myth interpretation and Freud's concept of dreamwork recognizes the importance of contextual relationships for the interpretation of any individual element in a dream. This suggestion would find an important point of rapprochement between the structuralist and psychoanalytic approaches to myth in Freud's thought. Carl Jung extended the transhistorical, psychological approach with his theory of the "collective unconscious" and the archetypes (inherited "archaic" patterns), often encoded in myth, that arise out of it. According to Jung, "myth-forming structural elements must be present in the unconscious psyche." Comparing Jung's methodology with Joseph Campbell's theory, Robert A. Segal (1990) concludes that "to interpret a myth Campbell simply identifies the archetypes in it. An interpretation of the Odyssey, for example, would show how Odysseus's life conforms to a heroic pattern. Jung, by contrast, considers the identification of archetypes …

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