Res Gestae
Ammianus Marcellinus
Ammianus Marcellinus. Ammianus Marcellinus, with an English translation, Vols. I-III. Rolfe, John C., translator. Cambridge, MA; London: Harvard University Press; W. Heinemann, 1935-1940 (printing).
After passing the places mentioned, one comes to the grotto of Aulion and the river Callichorus,[*](Of beautiful dances.) which owes its name to the fact that Bacchus, when he had after three years vanquished the peoples of India, returned to those regions, and on the green and shady banks of that river renewed the former orgies and dances;[*](Val. Flacc. v. 75.) some think that this kind of festival was also called trieterica.[*](As celebrated every third year; cf. Virg., Aen. iv. 302.)
Beyond these
A short distance from these are the Achaei, who, after the end of an earlier war at Troy (not the one which was fought about Helen, as some writers have asserted), being carried out of their course by contrary winds to Pontus, and meeting enemies everywhere, were unable to find a place for a permanent home; and so they settled on the tops of mountains covered with perpetual snow, where, compelled by the rigorous climate, they became accustomed to make a dangerous living by robbery, and hence became later beyond all measure savage. About the Cercetae, who adjoin them, we have no information worth mentioning.