Columbia subject headings:
Castles--Greece--History.
Catalan Grand Company.
Catalans--Greece--History.
Fortification--Greece--History.
Towers--Greece--History.
Harvard subject headings:
Castles--Greece--History.
Catalan Grand Company
Catalans--Greece--History--To 1500.
Catalonia (Spain)--Relations--Greece.
Excavations (Archaeology)--Greece--History.
Fortification--Greece--History--To 1500.
Greece--Relations--Spain--Catalonia.
Towers--Greece--History.
Princeton subject headings:
Castles--Greece--History.
Catalan Grand Company.
Catalans--Greece--History.
Fortification--Greece--History.
Towers--Greece--History.