A Dictionary of Greek and Roman biography and mythology

2. The satrap of Persis, fled after the battle of Guagamela, B. C. 331, to secure the Persian Gates, a pass which Alexander had to cross in his march to Persepolis. Alexander was at first unable to force the pass; but some prisoners, or, according to other accounts, a Lycian, having acquainted him with a way over the mountains, he was enabled to gain the heights above the Persian camp. The Persians then took to flight, and Ariobarzanes escaped with a few horsemen to the mountains. (Arrian, 3.18 Diod. 17.68; Curt. 5.3, 4.)