Columbia subject headings:
Architecture, Medieval--Italy--Sicily--Foreign influences.
Architecture--Italy--Sicily--Foreign influences.
Swabians--Italy--Sicily.
Harvard subject headings:
Architecture, Medieval--Italy--Sicily--Foreign influences.
Architecture--Italy--Sicily--Foreign influences.
Sicily (Italy)--History--1194-1282
Swabians--Italy--Sicily.
Princeton subject headings:
Architecture, Medieval--Italy--Sicily--Foreign influences.
Architecture--Italy--Sicily--Foreign influences.
Swabians--Italy--Sicily.