Columbia subject headings:
Architecture, Medieval--Holy Roman Empire--Congresses.
Germany--History--Hohenstaufen, 1138-1254--Congresses.
Hohenstaufen, House of--Congresses.
Holy Roman Empire--History--Hohenstaufen, 1138-1254--Congresses.
Holy Roman Empire--Kings and rulers--Mythology--Congresses.
Harvard subject headings:
Architecture, Medieval--Holy Roman Empire--Congresses.
Germany--History--Hohenstaufen, 1138-1254--Congresses.
Hohenstaufen, House of--Congresses.
Holy Roman Empire--History--Hohenstaufen, 1138-1254--Congresses.
Holy Roman Empire--Kings and rulers--Mythology--Congresses.
Princeton subject headings:
Architecture, Medieval--Holy Roman Empire--Congresses.
Germany--History--Hohenstaufen, 1138-1254--Congresses.
Hohenstaufen, House of--Congresses.
Holy Roman Empire--History--Hohenstaufen, 1138-1254--Congresses.
Holy Roman Empire--Kings and rulers--Mythology--Congresses.