Columbia subject headings:
Names, Geographical--Byzantine Empire.
Names, Geographical--Pontus.
Names, Geographical--Trebizond Empire.
Pontus--Antiquities, Byzantine.
Pontus--Description and travel.
Trebizond Empire--Antiquities, Byzantine.
Trebizond Empire--Description and travel.
Harvard subject headings:
Names, Geographical--Byzantine Empire.
Names, Geographical--Byzantine.
Names, Geographical--Pontus.
Names, Geographical--Trebizond Empire.
Names, Geographical.
Pontus--Antiquities, Byzantine.
Pontus--Description and travel.
Trebizond Empire--Antiquities, Byzantine.
Trebizond Empire--Description and travel.
Princeton subject headings:
Names, Geographical--Byzantine Empire.
Names, Geographical--Pontus.
Names, Geographical--Trebizond Empire.
Pontus--Antiquities, Byzantine.
Pontus--Description and travel.
Trebizond Empire--Antiquities, Byzantine.
Trebizond Empire--Description and travel.