Columbia subject headings:
Otranto (Italy)--History--Congresses.
Turkey--History--Mehmed II, 1451-1481--Congresses.
Harvard subject headings:
Italy--History--15th century--Congresses.
Otranto (Italy)--History--Congresses.
Turkey--History--Mehmed II, 1451-1481--Congresses.
Princeton subject headings:
Otranto (Italy)--History--Congresses.
Turkey--History--Mehmed II, 1451-1481--Congresses.