Columbia subject headings:
Harvard subject headings:
Frederick I, Holy Roman Emperor, approximately 1123-1190.
Germany--History--Frederick I, 1152-1190--Historiography.
Italy--History--476-1492--Historiography.
Princeton subject headings:
Frederick I, Holy Roman Emperor, approximately 1123-1190.
Germany--History--Frederick I, 1152-1190--Historiography.
Italy--History--476-1492--Historiography.