Original name of the Vatican Library, whose present name dates from 1588 when Pope Sixtus V commissioned Fontana to erect a new building to house the books of the old Palatine Library. At present it refers to a collection in the Vatican which was donated from the Heidelberg Library by Maximilian of Bavaria, 1622. It contains from 10,000 to 12,000 printed books and about 2,450 manuscripts.