Columbia subject headings:
Harvard subject headings:
Italy--Commerce--Middle East--History--Congresses.
Middle East--Commerce--Italy--History--Congresses.
Princeton subject headings:
Byzantine Empire--Commerce--Italy--History--Congresses.
Byzantine Empire--Foreign economic relations--Italy--Congresses.
Italy--Commerce--Byzantine Empire--History--Congresses.
Italy--Commerce--Middle East--History--Congresses.
Italy--Foreign economic relations--Byzantine Empire--Congresses.
Italy--Foreign economic relations--Middle East--Congresses.
Middle East--Commerce--Italy--History--Congresses.
Middle East--Foreign economic relations--Italy--Congresses.