Columbia subject headings:
Harvard subject headings:
Ionian Islands (Greece)--History.
Princeton subject headings:
Catholic Church--Relations--Orthodox Eastern Church--History.
Ionian Islands (Greece)--History.
Ionian Islands (Greece)--Politics and government.
Ionian Islands (Greece)--Relations--Italy--Venice.
Orthodox Eastern Church--Relations--Catholic Church--History.
Venice (Italy)--Relations--Greece--Ionian Islands.