" Sometimes what-if fantasies are useful. Imagine that the entirety of Western civilisation’s coding for computer systems or prints of all films ever made or all copies of Shakespeare and the Bible and the Qur’an were encrypted and held on one tablet device. And if that tablet was lost, stolen, burnt or corrupted, then our knowledge, use and understanding of that content, those words and ideas, would be gone for ever – only, perhaps, lingering in the minds of a very few men of memory whose job it had been to keep ideas alive. This little thought-experiment can help us to comprehend the totemic power of manuscripts. This is the great weight of responsibility for the past, the present and the future that the manuscripts of Constantinople carried. Much of our global cultural heritage – philosophies, dramas, epic poems – survive only because they were preserved in the city’s libraries and scriptoria. Just as Alexandria and Pergamon too had amassed vast libraries, Constantinople understood that a physical accumulation of knowledge worked as a lode-stone – drawing in respect, talent and sheer awe. These texts contained both the possibilities and the fact of empire and had a quasi-magical status. This was a time when the written word was considered so potent – and so precious – that documents were thought to be objects with spiritual significance. (...)

It was in Constantinople that the book review was invented. Scholars seem to have had access to books within a proto-lending-library system, and there were substantial libraries within the city walls. Thanks to Constantinople, we have the oldest complete manuscript of the Iliad, Aeschylus’ dramas Agamemnon and Eumenides, and the works of Sophocles and Pindar. Fascinating scholia in the margins correct and improve: plucking work from the page ‘useful for the reader . . . not just the learned’, as one Byzantine scholar put it. These were texts that were turned into manuals for contemporary living. "

― Bettany Hughes , Istanbul: A Tale of Three Cities