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"In the second half of the nineteenth century, the Protrepticus ('Exhortation to Philosophy') by Iamblichus of Chalcis, the second book of his ten-volume introduction to Pythagorean philosophy, became the site of a series of important philological discoveries. It had long been known that Iamblichus (floruit late third and early fourth century CE), in composing the Protrepticus, had made extensive use of lengthy extracts from earlier thinkers, subjected to differing degrees of editorial modification"--