ðə lˈaɪbɹɛɹiz kˈɑːntɛnts ɑːɹ nˈoʊn θɹuː ɐn ˈɪnvəntˌoːɹi ʌvðə lˈæɾɚ hˈæf ʌvðə twˈɛlfθ sˈɛntʃɚɹi, ænd ɪt wʌz ɛkstɹˈiːmli ɹˈɪtʃ ɪn ˈeɪntʃənt mˈænjuːskɹˌɪpts.
The library's contents are known through an inventory of the latter half of the 12th century, and it was extremely rich in ancient manuscripts.