Columbia subject headings:
Civilization, Medieval.
Europe--Church history--600-1500.
Sylvester II, Pope, approximately 945-1003.
Harvard subject headings:
Civilization, Medieval
Europe--Church history--600-1500.
Sylvester II, Pope, approximately 945-1003.
Princeton subject headings:
Civilization, Medieval.
Europe--Church history--600-1500.
Sylvester II, Pope, approximately 945-1003.