  First, it is possible that more of the papyri were copied in the first century CE than has usually been thought, which would put them outside the lifetime of Philodemus. Rather a large number of scribes worked on the papyri, and there are indications that the copies we have were only some among many copies of the same works. There is little indication, too, that the papyri were actually copied in Herculaneum; and we have little understanding of whatever book trade existed in Campania in the first century BCE. While Naples was a prominent Greek city and may well have supported a trade in Greek books, as it certainly supported an Epicurean school led by Siro, Rome was now the center of the world (cf. Sedley 2003) and a place where Philodemus could have found many of the books he cited in his work.