The Bodleian Library is the main research library of the University of Oxford and is one of the oldest libraries in Europe. The original library, destroyed in the reign of Edward VI, was replaced in 1602, chiefly through the efforts of Sir Thomas Bodley. The library has one of the great collections of English books, and its extensive manuscript collection is especially rich in biblical and Arabic material. Centuries of Oxford scholars have informally called it the what? Discuss