About this Longinus, while much is written, little is certainly known. Was he a descendant of a freedman of one of the Cassii Longini, or of an eastern family with a mixture of Greek and Roman blood? The author of the Treatise avows himself a Greek, and apologises, as a Greek, for attempting an estimate of Cicero. Longinus himself was the nephew and heir of Fronto, a Syrian rhetorician of Emesa. Whether Longinus was born there or not, and when he was born, are things uncertain. Porphyry, born in 233 A.D., was his pupil: granting that Longinus was twenty years Porphyry’s senior, he must have come into the world about 213 A.D. He travelled much, studied in many cities, and was the friend of the mystic Neoplatonists, Plotinus and Ammonius. The former called him “a philologist, not a philosopher.” Porphyry shows us Longinus at a supper where the plagiarisms of Greek writers are discussed--a topic dear to trivial or spiteful mediocrity. He is best known by his death. As the Greek secretary of Zenobia he inspired a haughty answer from the queen to Aurelian, who therefore put him to death. Many rhetorical and philosophic treatises are ascribed to him, whereof only fragments survive. Did he write the Treatise on the Sublime? Modern students prefer to believe that the famous essay is, if not by Plutarch, as some hold, at least by some author of his age, the age of the early Caesars. The arguments for depriving Longinus, Zenobia’s tutor, of the credit of the Treatise lie on the surface, and may be briefly stated. He addresses his work as a letter to a friend, probably a Roman pupil, Terentianus, with whom he has been reading a work on the Sublime by Caecilius. Now Caecilius, a voluminous critic, certainly lived not later than Plutarch, who speaks of him with a sneer. It is unlikely then that an author, two centuries later, would make the old book of Caecilius the starting-point of his own. He would probably have selected some recent or even contemporary rhetorician. Once more, the writer of the Treatise of the Sublime quotes no authors later than the Augustan period. Had he lived as late as the historical Longinus he would surely have sought examples of bad style, if not of good, from the works of the Silver Age. Perhaps he would hardly have resisted the malicious pleasure of censuring the failures among whom he lived. On the other hand, if he cites no late author, no classical author cites him, in spite of the excellence of his book. But we can hardly draw the inference that he was of late date from this purely negative evidence.