Note:  Do not rely on this information. It is very old.

Longinus

Longinus, Dionysius Cassius (circa 213-73), philosopher and rhetorician, studied under Ammonius at Alexandria, and taught at Athens. He settled at Palmyra, and became chief counsellor of Zenobia, whom he encouraged to resist Rome. He was consequently beheaded by Aurelian. His views were modelled upon Plato, and a work On the Sublime exists, with which he is commonly, though probably erroneously, credited.