Mnemosyne — Classical Greek Myth Library

Hera had sworn enmity to Zeus’s son by Alcmene. Yet a strand of classical myth—strong in Hellenistic and handbook astronomy—tells that Hermes (or Athena, or Zeus himself) brought the infant Heracles to the sleeping Hera and set him to her breast. The child nursed so vigorously that Hera woke and thrust him away; the divine milk sprayed across the heavens and became the Milky Way (*galaxias kuklos*, the milky circle). In some tellings the taste of Hera’s milk already conferred a share of immortality, preparing the later apotheosis; in others the point is purely celestial aetiology. Diodorus preserves a related deception: after the birth, Zeus (or Athena) tricks Hera into offering the breast as if to a foundling, then reveals the child. Whether framed as theft of milk or as a brief truce of nurture, the story explains why a band of light crosses the night sky and why Heracles, alone among heroes, can stand among the gods: he has drunk from the queen of Olympus. The tale is late relative to Homeric hostility, yet it circulates as classical star-myth and Theban-Olympian lore, not as a medieval invention.