Strabo, Geography

The stories that have been spread far and wide with a view to glorifying Alexander are not accepted by all; and their fabricators were men who cared for flattery rather than truth. For instance: they transferred the Caucasus into the region of the Indian mountains and of the eastern sea which lies near those mountains from the mountains which lie above Colchis and the Euxine; for these are the mountains which the Greeks named Caucasus, which is more than thirty thousand stadia distant from India; and here it was that they laid the scene of the story of Prometheus and of his being put in bonds; for these were the farthermost mountains towards the east that were known to writers of that time. And the expedition of Dionysus and Heracles to the country of the Indians looks like a mythical story of later date, because Heracles is said to have released Prometheus one thousand years later. And although it was a more glorious thing for Alexander to subdue Asia as far as the Indian mountains than merely to the recess of the Euxine and to the Caucasus, yet the glory of the mountain, and its name, and the belief that Jason and his followers had accomplished the longest of all expeditions, reaching as far as the neighborhood of the Caucasus, and the tradition that Prometheus was bound at the ends of the earth on the Caucasus, led writers to suppose that they would be doing the king a favor if they transferred the name Caucasus to India.