Columbia subject headings:
Europe--Politics and government--476-1492--Congresses.
Politics and war--Europe--Congresses.
Harvard subject headings:
Europe--Politics and government--476-1492--Congresses.
Peace-building--Europe--Congresses.
Politics and war--Europe--Congresses.
Princeton subject headings:
Europe--Politics and government--476-1492--Congresses.
Peace-building--Europe--Congresses.
Politics and war--Europe--Congresses.