Arrian's Periplus
Arrian of Nicomedia (c.87 - after 145): Greek historian and senator of the Roman empire, author of several historical studies. His best-known work is the Anabasis, which deals with Alexander the Great. Arrian is the author of various other philosophical and historical texts.
Arrian's Periplus once consisted of twenty-five books, but is for the greatest part lost to us. Nevertheless, the beginning survives. Arrian directed himself, as if he were writing a letter, to his personal friend, the emperor Hadrian. The translator is unknown.