Columbia subject headings:
Chienti River Valley (Italy)--History.
Civilization, Medieval.
Europe--History--476-1492.
Harvard subject headings:
Architecture, Medieval--Italy--Chienti River Valley.
Chienti River Valley (Italy)--History.
Church buildings--Italy--Chienti River Valley.
Civilization, Medieval
Europe--History--476-1492.
Italy--History--Carolingian rule, 774-887.
Princeton subject headings:
Chienti River Valley (Italy)--History.
Civilization, Medieval.
Europe--History--476-1492.