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The only evidence we have concerning the date of Porphyry's is that it was written during his stay in Sicily, which lasted from 268 until his return to Rome after Plotinus’ death in 270. How soon after is unknown. Castricius’ lapse from the vegetarianism of the Plotinian school and Porphyry's attempt to recall him to the fold with De Abstinentia should presumably be placed after Plotinus’ death, and Porphyry was still in Sicily at the time. Cassius Longinus’ letter from Phoenicia, apparently written after Plotinus’ death, seems to have found Porphyry still in Sicily. Thus he may still have been there in 271, or possibly even later. There is nothing to support the common view that he returned to Rome immediately or even soon after Plotinus’ death.
The idea of structural analysis of the Aeneid has been attacked recently by some who believe that too complicated mathematics are involved in line totals involving a golden mean. The object of the present article is to investigate whether simpler numerical effects are discernible in the poem, and whether these effects were deliberately inserted by Virgil.
The significant numbers to be examined in this connexion are 3, 7, 12, and 30. The first three of these are among the ritualistic numbers whose use in the Aeneid was discussed by C. P. Clark, while 30 is among other things part of the series 3, 30, 300 (total 333) which we encounter in Aen. I. 261–96.