Columbia subject headings:
Italy--History--1268-1492--Congresses.
Italy--Politics and government--1268-1559--Congresses.
Municipal government--Italy--History--Congresses.
Harvard subject headings:
Italy--History--1268-1492--Congresses.
Italy--Politics and government--1268-1559--Congresses.
Municipal government--Italy--History--Congresses.
Power (Social sciences)--Italy--History--Congresses.
Princeton subject headings:
Italy--History--1268-1492--Congresses.
Italy--Politics and government--1268-1559--Congresses.
Municipal government--Italy--History--Congresses.