Justin was a Latin writer and historian who lived under the Roman Empire. Almost nothing is known of Justin's personal history, his name appearing only in the title of his work. He must have lived after Gnaeus Pompeius Trogus, whose work he excerpted, and his references to the Romans and Parthians having divided the world between themselves would have been anachronistic after the rise of the Sassanians in the third century. His Latin appears to be consistent with the style of the second century.