Columbia subject headings:
Middle Ages--Congresses.
Military art and science--History--Medieval, 500-1500--Congresses.
Peace in literature--Congresses.
Peace--History--Congresses.
War in art--Congresses.
War in literature--Congresses.
War--History--Congresses.
Harvard subject headings:
Civilization, Medieval--Congresses
Europe--History, Military--Congresses.
Middle Ages--Congresses
Military art and science--History--Medieval, 500-1500--Congresses.
Peace in literature--Congresses.
Peace--History--Congresses.
War in art--Congresses.
War in literature--Congresses.
War--History--Congresses.
Princeton subject headings:
Civilization, Medieval--Congresses.
Europe--History, Military--Congresses.
Peace--History--Congresses.