Columbia subject headings:
Nobility--Travel--Europe.
Prussia (Germany)--History.
Teutonic Knights--History.
Harvard subject headings:
Nobility--Europe--History
Prussia, East (Poland and Russia)--History, Military.
Prussia, East (Poland and Russia)--History.
Teutonic Knights--History.
Princeton subject headings:
Nobility--Europe--History.
Prussia (Germany)--History.
Teutonic Knights--History.