An amazing place to be sure, but one that lacks the exact person you are in search of– Guile.
Among the many books, you would find here, none of them would help you locate the one person whom may just possess the most important piece of evidence you could possibly locate.
You spend a while gawking at the impressive collection of ancient books, but do not bother to enter the library. Even if the data for the books were loaded into the manuscripts, you would likely be unable to read the Latin, Greek, and Middle and Old English texts. Besides, you don’t want to have to explain to a librarian– assuming they exist in this period– why you are putting your nose where it doesn’t have authorization.