Columbia subject headings:
Italy--Civilization--1268-1559--Congresses.
Italy--Civilization--476-1268--Congresses.
Italy--History--476-1492--Congresses.
Harvard subject headings:
Historiography--Italy--History--Congresses.
Italy--Civilization--1268-1492--Congresses.
Italy--Civilization--1268-1559--Congresses.
Italy--Civilization--476-1268--Congresses.
Italy--History--1268-1492--Congresses.
Italy--History--476-1268--Congresses.
Italy--History--476-1492--Congresses.
Princeton subject headings:
Italy--Civilization--1268-1559--Congresses.
Italy--Civilization--476-1268--Congresses.
Italy--History--1268-1492--Congresses.
Italy--History--476-1268--Congresses.