Iris

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Iris is the Greek goddess of the rainbow and one of the messengers of the gods, named after the band of colour itself — iris is simply the Greek word for the rainbow. Where later poets gave the role of divine herald to Hermes, the older epic tradition sent Iris: she is the runner who carries the will of the higher gods down to mortals and across the distances of the sea, and the rainbow is the road she travels.

Hesiod’s Theogony makes her a daughter of the sea-spirit Thaumas — whose name means “wonder” — and the Oceanid Electra, and sister to the Harpies, the storm-snatchers. The genealogy is itself a small piece of natural reading: the rainbow born of wonder and water, kin to the winds. In the Iliad Iris is the gods’ tireless courier, dispatched by Zeus and Hera to summon, warn, and command; the Homeric Hymn to Demeter shows her sent to fetch the grieving goddess back to the assembly of the gods. She is rarely an actor in her own right. Her character is the errand — swift, golden-winged, obedient — and the ancient epithets fix her by motion: wind-footed, storm-footed, swift as the gust.

One strand of cult and poetry tied her to the underworld as well as the upper air. Hesiod has the gods send Iris to bring water from the river Styx when an oath among the immortals must be sworn and sealed, so that the same figure who links heaven to earth also reaches down to the binding river below. The rainbow that touches both horizons made her a natural emblem of connection between separated realms — sky and ground, gods and mortals, the living world and what lies under it.

Iris was never the centre of a major cult; she has no great temple and little independent myth, and that marginality is part of what the sources show. The Greeks read the rainbow as a sign rather than a permanent thing — a bridge that appears and is gone — and the goddess shares that quality. In later antiquity, as Hermes absorbed more of the herald’s work and as allegorical reading grew, writers treated her chiefly as a personification: the rainbow named and given a face, a way of saying that even a passing arc of light might be a message on its way. What survives of her is less a story than an image held steadily over centuries — the bright path between the worlds, and the small swift figure who runs along it.

→ Related: Hyperion · Iapetos · Erebos