Columbia subject headings:
Europe--History--476-1492--Congresses.
Europe--History--476-1492--Historiography.
Harvard subject headings:
Europe--History--476-1492--Congresses.
Europe--History--476-1492--Historiography--Congresses.
Princeton subject headings:
Europe--History--476-1492--Congresses.
Europe--History--476-1492--Historiography.