Columbia subject headings:
Harvard subject headings:
Germany, Southern--History.
Guelf, House of--History.
Nobility--Germany
Welf VI, Duke of Spoleto, 1115?-1191.
Princeton subject headings:
Frederick I, Holy Roman Emperor, approximately 1123-1190--Congresses.
Germany, Southern--History--Congresses.
Guelf, House of--Congresses.
Swabia (Germany)--History--Congresses.
Tyrol (Austria)--History--Congresses.
Welf VI, Duke of Spoleto, 1115-1191--Congresses.