Iris.

    Daughter of the Titan Thaumas and the Oceanid Electra, Iris was the personification of the rainbow. Her main function was as messenger of the gods, especially Hera (Juno) and Zeus (Jupiter). According to Alcaeus, she and Zephyr, god of the west wind, were the parents of Eros (Cupid).
    In archaic and Classical art Iris is depicted holding the herald’s staff. Although wingless in earlier representations, by the Classical era she is always shown with wings, an attribute that persists in the postclass-ical era. She is occasionally pictured as bringing sleep, and sometimes represents Air in allegories of the four Elements.
    
     Classical Sources. Homer, Iliad 3.121, 8.3971!., 15.143!!., 18.166, 24.77Ü. Hesiod, Theogony 265!!., 780-87. Homeric Hymns, “To Delian Apollo” line 102. Alcaeus, fragment 13 Bergk. Euripides, Heracles 822ff. Aristophanes, The Birds. Apollonius Rhodius, Argonautica 2.283-300, 4.753-779. Callimachus, Hymns 4, “To Delos” lines 22!, 66f., 228! Virgil, Aeneid 4.693!!., 5.605!!., 9.iff. Ovid, Metamorphoses 1.207!, 271; 4.480; 11.585!!, 682; 14.85, 839. Lucian, Dialogues of the Sea Gods 9, “Iris and Poseidon.”
    See also Aeneas, in Latium; Gods and Goddesses, as Elements; Jason, Phineus and the Harpies; Trojan War.