Columbia subject headings:
Germany--History--Interregnum, 1254-1273.
Germany--Kings and rulers.
Habsburg, House of.
Holy Roman Empire--History--Interregnum, 1254-1273.
Holy Roman Empire--Kings and rulers.
Rudolf I, King of Germany, 1218-1291.
Harvard subject headings:
Germany--History--Interregnum, 1254-1273.
Germany--Kings and rulers.
Habsburg, House of.
Holy Roman Empire--History--Interregnum, 1254-1273.
Holy Roman Empire--Kings and rulers.
Rudolf I, King of Germany, 1218-1291.
Princeton subject headings: