Onesicritus (Ὀνησίκριτος), a Greek historical writer, (lived c. 360-c. 290 BC), who accompanied Alexander on his campaigns in Asia. He became a chief pilot of Alexander's fleet, and when he returned home, he wrote a history of Alexander's campaigns. He is frequently cited by later authors, who also criticize him for his inaccuracies.


He was a native of Astypalaia, and it was probably to this island origin that he owed the nautical skills which would prove so advantageous to him. He was a disciple of Diogenes of Sinope, the Cynic philosopher. Diogenes Laërtius also calls him "Onesicritus of Aegina", and says that he came to Athens because his two adult sons, Androsthenes and Philiscus, were attracted to the philosophy of Diogenes the Cynic, whence Onesicritus also became an ardent disciple. If so, he must have been already advanced in years when he joined the expedition of Alexander.

We have no account of the circumstances which led him to accompany Alexander into Asia, nor in what capacity he attended on the conqueror; but during the expedition into India he was sent by the king to hold a conference with the Indian philosophers or Gymnosophists, the details of which have been transmitted to us from his own account of the interview. When Alexander constructed his fleet on the Hydaspes, he appointed Onesicritus to the important station of pilot of the king's ship, or chief pilot of the fleet (ἀρχικυϐερνήτης), a post which he held not only during the descent of the Indus, but throughout the long and perilous voyage from the river to the Persian gulf. Alexander was so satisfied with his work that, on his arrival at Susa, Onesicritus was rewarded with a crown of gold, at the same time as Nearchus. Yet Arrian blames him for lack of judgment, and on one occasion expressly ascribes the safety of the fleet to the firmness of Nearchus in overruling his advice. We know nothing of his subsequent fortunes; but from an anecdote related by Plutarch it seems probable that he attached himself to Lysimachus, and it was perhaps at the court of that monarch that he composed his historical work, though, on the other hand, a passage of Lucian might suggest that this was begun during the lifetime of Alexander himself.


We learn from Diogenes Laërtius that Onesicritus wrote a work about Alexander called How Alexander was Educated (Πῶς Ἀλέξανδρος Ἤχθη), imitating the style of Xenophon, though he fell short of him as a copy does of the original. It is most frequently cited in regard to the campaigns of Alexander in Asia, and for descriptions of the countries that he visited. Though an eye-witness of much that he described, it appears that he intermixed many fables and falsehoods with his narrative, so that he early fell into discredit as an authority. Strabo is especially severe upon him. Plutarch cites him as one of those who related the fable of the visit of the Amazons to Alexander, for which he was justly ridiculed by Lysimachus, and Arrian accuses him of falsely representing himself as the commander of the fleet, when he was in truth only the pilot. Aulus Gellius even associates him with Aristeas of Proconnesus, and other purely fabulous writers. But it is clear that these censures are overcharged; and though some of the statements cited from him are certainly gross exaggerations, his work appears to have contained much valuable information concerning the remote countries for the first time laid open by the expedition of Alexander. In particular he was the first author that mentioned the island of Taprobane.


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