Told by Gaia and Uranus

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Now Zeus, king of the gods, made Metis his wife first, and she was wisest among gods and mortal men. But when she was about to bring forth the goddess bright-eyed Athene, Zeus craftily deceived her with cunning words and put her in his own belly, as Earth and starry Heaven advised. For they advised him so, to the end that no other should hold royal sway over the eternal gods in place of Zeus; for very wise children were destined to be born of her, first the maiden bright-eyed Tritogeneia, equal to her father in strength and in wise understanding; but afterwards she was to bear a son of overbearing spirit, king of gods and men. But Zeus put her into his own belly first, that the goddess might devise for him both good and evil.


- Hesiod, The Theogony, The Olympian Gods


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Zeus had intercourse with Metis, who turned into many shapes in order to avoid his embraces. When she was with child, Zeus, taking time by the forelock, swallowed her, because Earth said that, after giving birth to the maiden who was then in her womb, Metis would bear a son who should be the lord of heaven. From fear of that Zeus swallowed her. And when the time came for the birth to take place, Prometheus or, as others say, Hephaestus, smote the head of Zeus with an axe, and Athena, fully armed, leaped up from the top of his head at the river Triton.


- Pseudo-Apollodorus, The Library, Book 1, Chapter 3, Section 6


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