Columbia subject headings:
Napoleon I, Emperor of the French, 1769-1821.
Pius VII, Pope, 1742-1823.
Harvard subject headings:
Napoleon I, Emperor of the French, 1769-1821
Napoleon I, Emperor of the French, 1769-1821--Relations with popes.
Pius VII, Pope, 1742-1823
Princeton subject headings:
Napoleon I, Emperor of the French, 1769-1821.
Pius VII, Pope, 1742-1823.