Columbia subject headings:
Civilization, Medieval--Congresses.
Oaths--History--To 1500--Congresses.
Swearing--History--To 1500--Congresses.
Harvard subject headings:
Civilization, Medieval--Congresses
Oaths--History--Congresses.
Swearing--History--Congresses.
Princeton subject headings:
Civilization, Medieval--Congresses.
Oaths--History--To 1500--Congresses.
Swearing--History--To 1500--Congresses.