Columbia subject headings:
Harvard subject headings:
Architecture, Medieval--Holy Roman Empire.
Castles--Holy Roman Empire.
Church architecture--Holy Roman Empire.
Germany--History--Hohenstaufen, 1138-1254.
Hohenstaufen, House of--History--Pictorial works.
Hohenstaufen, House of.
Holy Roman Empire--History--Hohenstaufen, 1138-1254--Pictorial works.
Holy Roman Empire--History--Hohenstaufen, 1138-1254.
Princeton subject headings:
Hohenstaufen, House of--History--Pictorial works.
Holy Roman Empire--History--Hohenstaufen, 1138-1254--Pictorial works.