Columbia subject headings:
Byzantine Empire--History--1081-1453--Early works to 1800.
Comnenus family--History--Early works to 1800.
Pontus--History--Early works to 1800.
Trebizond Empire--Civilization--Sources--Early works to 1800.
Trebizond Empire--History--Sources--Early works to 1800.
Harvard subject headings:
Byzantine Empire--History--1081-1453--Early works to 1800.
Comnenus family--History--Early works to 1800.
Pontus--History--Early works to 1800.
Trebizond Empire--Civilization--Sources--Early works to 1800.
Trebizond Empire--History--Sources--Early works to 1800.
Princeton subject headings:
Byzantine Empire--History--1081-1453--Early works to 1800.
Comnenus family--History--Early works to 1800.
Pontus--History--Early works to 1800.
Trebizond Empire--Civilization--Sources--Early works to 1800.
Trebizond Empire--History--Sources--Early works to 1800.