Columbia subject headings:
Catholic Church--Relations--Islam--Papal documents.
Islam--Relations--Catholic Church--Papal documents.
Mehmed II, Sultan of the Turks, 1432-1481.
Pius II, Pope, 1405-1464.
Harvard subject headings:
Catholic Church--Relations--Islam--Papal documents.
Islam--Relations--Catholic Church--Papal documents.
Mehmed II, Sultan of the Turks, 1432-1481.
Pius II, Pope, 1405-1464.
Princeton subject headings: