Arke was a daughter of Thaumas and sister of Iris. She is sometimes affiliated with the faded second rainbow. She is said to have iridescent wings, compared to Iris's golden wings. During the Titanomachy, she betrayed the Olympian gods and joined the Titans against them, becoming the Titans' messenger goddess. When the Olympians won, Zeus deprived Arke of her wings and cast her into Tartarus, together with the other 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 where his surname Podarces (literally "swift-footed", as if from πούς, gen. ποδός "foot" + the name of Arke) was thought to have come from.