Columbia subject headings:
Harvard subject headings:
Catholic Church--Italy--Sicily--Political activity--History.
Church and state--Catholic Church--History
Church and state--Italy--Sicily--History.
Clergy--Italy--Sicily--Political activity--History.
Sicily (Italy)--Church history.
Sicily (Italy)--History--1282-1409
Princeton subject headings:
Catholic Church--Italy--Sicily--Political activity--History.
Church and state--Catholic Church--History.
Church and state--Italy--Sicily--History.
Clergy--Italy--Sicily--Political activity--History.
Sicily (Italy)--Church history.
Sicily (Italy)--History--1289-1409.