Columbia subject headings:
Harvard subject headings:
Germany--History--843-918--Congresses.
Germany--Kings and rulers--Biography--Congresses.
Ludwig, King of the East Franks, 804-876--Congresses.
Princeton subject headings:
Franks--History--814-843--Congresses.
Franks--History--843-987--Congresses.
Germany--History--843-918--Congresses.
Germany--History--To 843--Congresses.
Germany--Kings and rulers--Biography--Congresses.
Ludwig, King of the East Franks, 804-876--Congresses.