Copernicus Treasury is an exhibition dedicated to one of the most famous students of the Jagiellonian University. It includes a unique set of three medieval astronomical instruments, which were bequeathed to the scholar's alma mater by Professor Marcin Bylica of Olkusz, the astrologer and physician at the court of the Hungarian King Matthias Corvinus in Buda at the time. The three incredibly precious instruments – an astrolabe, a torquetum and a celestial globe with astrolabe – may have been seen or even used by the young Nicolaus Copernicus during his studies. In addition to the donated instruments, the exhibition also includes other valuables such as astrolabes (with one particularly valuable Arabic astrolabe, dating back to the 11th century, displayed in a showcase), sundials, copies of various documents, and the facsimile of the famous work written by Copernicus entitled De revolutionibus orbium coelestium (‘On the Revolutions of the Celestial Spheres’).