The Royal Library in Copenhagen is the national library of Denmark and the university library of the University of Copenhagen. It is among the largest libraries in the world and the largest in the Nordic countries. In 2017 it merged with the State and University Library in Aarhus to form a combined national library. The combined library organisation is known as the Royal Danish Library .It contains numerous historical treasures, and a copy of all works printed in Denmark since the 17th century are deposited there. Thanks to extensive donations in the past, the library holds nearly all known Danish printed works back to and including the first Danish books, printed in 1482 by Johann Snell.

More details: https://en.wikipedia.org/wiki/Royal_Library,_Denmark