Longinus (Cassius Longinus), c.213–273, Greek rhetorician and philosopher of the Neoplatonic school. He taught rhetoric at Athens. He later became counselor to Queen Zenobia of Palmyra; when the anti-Roman policy he had advocated failed, he was delivered to the Romans, who executed him as a traitor. Of his numerous rhetorical, philosophical, and critical works, only fragments remain. On the Sublime, a Greek treatise of literary criticism, was long attributed to Longinus, but it is now agreed that the author, often known as Pseudo-Longinus, lived in the 1st cent. A.D.
See D. St. Marin, Bibliography of the Essay on the Sublime (1967).
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