Greek historian Arrian of Nicomedia (Latin: Lucius Flavius Arrianus; (c.95- c.180 CE) served in the Roman army and as prefect and legate of Cappadocia (131-37) before retiring to Greece and writing eight historical and philosophical works, four of which have survived. His chief work is the Anabasis of Alexander, a seven-volume history of the campaigns of Alexander the Great, which drew on Xenophon's account and has survived almost intact. An eighth book, Indica, deals with various matters about India and Nearchus' voyage with Alexander's fleet, drawing heavily on Megasthenes and Eratosthenes and the journal Nearchus kept.See here for a more detailed biographical sketch.
From the Anabasis of Alexander:
Alexander's Arabian expeditions Pages PDF
From Indica
Nearchus sails to the Persian Gulf Pages PDF