Columbia subject headings:
Frederick I, Holy Roman Emperor, approximately 1123-1190--Poetry.
Harvard subject headings:
Epic poetry, Latin (Medieval and modern)
Frederick I, Holy Roman Emperor, approximately 1123-1190--Poetry.
Holy Roman Empire--History--Frederick I, 1152-1190--Poetry.
Princeton subject headings:
Frederick I, Holy Roman Emperor, approximately 1123-1190--Poetry.
Poetry.