Arke

In ancient Greek mythology, Arke or Arce ( "Arkē") was a daughter of Thaumas and fraternal twin of Iris. She is sometimes affiliated with the faded second rainbow sometimes seen in the shadow of the first. 
Mythology.
During the Titanomachy, she sided with the Titans against the Olympian gods; she became the messenger for the Titans, while Iris became the messenger of the Olympian Gods.
When the Olympians won, Zeus punished Arke. She was deprived of her wings and cast into Tartarus, together with the vanquished Titans. Arke's wings were later given to Peleus and Thetis as a gift on their wedding day; Thetis later gave them to her son Achilles, which is thought to be the derivation of his surname "Podarces" (literally "swift-footed", as if from πούς, gen. ποδός "foot" + the name of Arke).