Aëtos

According to the surviving summary traditions, Aëtos is an earth-born (Gaia-derived) beautiful boy who became a childhood companion of Zeus while the god was concealed in Crete. Hera, fearing that Zeus loved the youth, transformed him into an eagle; this metamorphosis accounts for the bird becoming the sacred emblem and personal standard of Zeus. Variant strands of the tradition sometimes blur Aëtos with other eagle-motif accounts (notably the eagle involved in Ganymede's abduction) and with Zeus-in-eagle-form, but the core etiological role identifies Aëtos as the named origin of Zeus's eagle.

Before transformation Aëtos is described as a beautiful earth-born boy. After Hera's metamorphosis he is an eagle—the texts and summaries emphasize his identity as the eagle of Zeus but do not supply detailed descriptions of plumage, size, or coloration. Some traditions make the eagle that abducts Ganymede indistinguishable from this eagle, or else attribute that eagle to Zeus himself rather than to Aëtos, indicating overlap between appearances in variant accounts.

Mythic narratives record Aëtos performing specific instrumental actions rather than a broad suite of powers: he is said to have been the first to swear fealty to Zeus as king while Zeus hid in Crete; during the Gigantomachy he assisted Zeus by placing lightning bolts on Zeus's hands; and he acted as Zeus's appointed tormentor of Prometheus, appearing daily at dawn to tear at Prometheus's liver (which regenerated each night). These roles depict Aëtos as a loyal, divinely empowered emissary of Zeus within set mythic episodes. He is not invulnerable—Heracles shoots and kills the eagle when freeing Prometheus during the hero's eleventh labour.