To accept the story of the Arab destruction of the library of Alexandria, one must explain how it is that so dramatic an event was unmentioned and unnoticed not only in the rich historical literature of medieval Islam, but even in the literatures of the Coptic and other Christian churches, of the Byzantines, of the Jews, or anyone else who might have thought the destruction of a great library worthy of comment. That the story still survives, and is repeated, despite all these objections, is testimony to the enduring power of a myth.