Columbia subject headings:
Guelfs and Ghibellines.
Italy--History--1268-1492.
Italy--History--Germanic rule, 962-1268.
Harvard subject headings:
Guelfs and Ghibellines
Italy--History--1268-1492.
Italy--History--Germanic rule, 962-1268.
Italy--History.
Princeton subject headings:
Italy--Civilization--1268-1559.
Italy--Civilization--476-1268.
Italy--History--476-1492.
Middle Ages--Historiography.