The famous Palatine Library, the Bibliotheca Palatina, was founded and at first kept in the gallery of the Church of the Holy Spirit, where good light for reading was available. During the Thirty Years War from 1618 to 1648, this collection of manuscripts and early printed books was taken as booty by Maximilian I, Elector of Bavaria and presented to the Pope. Of the approximately 5,000 books and 3,524 manuscripts taken, a mere 885 were eventually returned in 1816. The rest form the Bibliotheca Palatina section of the Vatican Library. For the University Jubilee, many of these books were briefly brought back and displayed in Heidelberg.