Biblioteca Nazionale Braidense

The Braidense National Library (Italian: Biblioteca Nazionale Braidense), located in Milan, is one of Italy's largest libraries. Initially it contained large historical and scientific collections before it was charged with the legal deposit of all publications from Milan. Since 1880, it has had the status of a national library and is today one of the 47 Italian State libraries.

The library was created in 1770 by Maria Theresa of Austria when she decided to make the collection she had acquired from Carlo Pertusati available to the public.

The Wikipedia page is.

The website, in Italian, is.