Zetes and Calais

While Orithyia was playing by the Ilissus river, Boreas carried her off and had intercourse with her; and she bore daughters, Cleopatra and Chione, and winged sons, Zetes and Calais. These sons sailed with Jason and met their end in chasing the Harpies; but according to Acusilaus, they were killed by Hercules in Tenos.


- Apollodorus, Library, Book 3, Chapter 15, Section 2

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He spake, and rushed upon Tiphys son of Hagnias; and his eyes sparkled like flashes of ravening flame. And they would quickly have turned back to the land of the Mysians, forcing their way through the deep sea and the unceasing blasts of the wind, had not the two sons of Thracian Boreas held back the son of Aeacus with harsh words. Hapless ones, assuredly a bitter vengeance came upon them thereafter at the hands of Heracles, because they stayed the search for him. For when they were returning from the games over Pelias dead he slew them in sea-girt Tenos and heaped the earth round them, and placed two columns above, one of which, a great marvel for men to see, moves at the breath of the blustering north wind. These things were thus to be accomplished in after times. But to them appeared Glaucus from the depths of the sea, the wise interpreter of divine Nereus, and raising aloft his shaggy head and chest from his waist below...


- Apollonius Rhodius, Argonautica, Book 1