Columbia subject headings:
Marcellus II, Pope, 1501-1555--Congresses.
Harvard subject headings:
Italy--Church history--16th century.
Marcellus II, Pope, 1501-1555--Congressses.
Popes--Biography--Congresses.
Princeton subject headings:
Italy--Church history--16th century.
Marcellus II, Pope, 1501-1555--Congressses.
Popes--Biography--Congresses.