The Royal Library of Alexandria, associated with the Museum or Mouseion at Alexandria (Μουσεῖον τῆς Ἀλεξανδρείας), was probably founded around 300 BCE under the reign of Ptolemy I Soter or Ptolemy II. Though it was the largest library in the ancient world, and the repository of so much Greek literature that was eventually passed down to us, and also so much that was eventually lost, the number of papyrus rolls preserved at Alexandria at its peak, or any other time, is unknown. At its peak, the number of rolls that it might have held has been estimated by numerous scholars, without any reliable evidence, from as many as 400,000 to 700,000 to as few as 40,000, or even less. A typical papyrus roll probably contained a text about the length of one book of Homer.
Writing in 2002, American classical scholar Roger Bagnall argued that very high numbers of rolls traditionally estimated by scholars to have been held by the Royal Library of Alexandria, such as 400,000 to 700,000 rolls, may reflect modern expectations rather than the extent of written literature that may have been produced by ancient Greek writers:
"The computer databank of ancient Greek literature, the Thesurus Linguae Graecae, contains about 450 authors of whom at least a few words survive in quotation and whose lives are thought to have begun by the late fourth century. No doubt there were authors extant in the early Hellenistic period of whom not a line survives today, but we cannot estimate their numbers. Of most of these 450, we have literally a few sentences. There are another 175 known whose lives are placed, or whose births are placed in the third century B. C. Most of these authors probably wrote what by modern standards was a modest amount—a few book-rolls full, perhaps. Even the most voluminous authors of the group, like the Athenian dramatists, probably filled nor more than a hundred rolls or so. If the average writer filled 50 rolls, our known authors to the end of the third century would have produced 31,250 rolls. . . .
"To look at matters another way, just, 2,871,000 words of Greek are preserved for all authors known to have lived at least in part in the fourth century or earlier. Adding the third and second centuries brings the total to 3,773,000 words (or about 12,600 pages of 300 words each). At an average of 15,000 words per roll, this corpus would require a mere 251 rolls. Even at an average of 10,000 words per roll the figure would be only 377 rolls. It was estimated by one eminent ancient historian that the original bulk of historical writings in ancient Greece amounted to something like forty times what has survived. If so, our estimate would run to an original body of 10,000 to 15,000 rolls. This may be too low, but is it likely that it is too low by a factor of thirty or forty, and that only one word in 1,500 or 2,000 has survived? . . . (Roger S. Bagnall, "Alexandria: Library of Dreams," Proceedings of the American Philosophical Society, 146 (2002) 348-62, quoting from 352-53).
Traditionally the Alexandrian Library is thought to have been based upon the library of Aristotle. By tradition it is also believed, without concrete evidence, that the much of the collection of rolls was acquired by order of Ptolemy III, who supposedly required all visitors to Alexandria to surrender rolls in their possession. These writings were then copied by official scribes, the originals were put into the Library, and the copies were delivered to the previous owners.
The Alexandrian Library was associated with a school and a museum. Scholars at Alexandria were responsible for the editing and standardization for many earlier Greek texts. One of the best-known of these editors was Aristophanes of Byzantium, a director of the library, whose work on the text of the Iliad may be preserved in the Venetus A manuscript, but who was also known for editing authors such as Pindar and Hesiod.
Though it is known that portions of the Alexandrian Library survived for several centuries, the various accounts of the library's eventual destruction are contradictory. The Wikipedia article on the Library of Alexandria outlined four possible scenarios for its destruction:
♦ Other factors in the eventual destruction of the contents of the Alexandrian Library might have included the decay of the papyrus rolls as a result of the climate. Most of the papyrus rolls and fragments that survived after the Alexandrian Library did so in the dry sands of the Egyptian desert. Papyrus rolls do not keep well either in dampness or in salty sea air, to which they were likely exposed in the library located in the port of Alexandria. Thus, independently of the selected library destruction scenario, because of decay of the storage medium, or as a result of fires, rodent damage, natural catastrophes, or neglect, it is probable that significant portions of the information in the Alexandrian library were lost before the library was physically destroyed.
Whatever the circumstances and timing of the physical destruction of the Library, it is evident that by the eighth century the Alexandrian Library was no longer a significant institution.