Columbia subject headings:
Frederick I, Holy Roman Emperor, approximately 1123-1190.
Italy--History--476-1268.
Lombardy (Italy)--History.
Harvard subject headings:
Frederick I, Holy Roman Emperor, approximately 1123-1190.
Italy--History--476-1268.
Lombardy (Italy)--History.
Princeton subject headings:
Frederick I, Holy Roman Emperor, approximately 1123-1190.
Italy--History--476-1268.
Lombardy (Italy)--History.