Columbia subject headings:
Byzantine Empire--Historiography.
Byzantine Empire--Relations--Kievan Rus.
Kievan Rus--Relations--Byzantine Empire.
Harvard subject headings:
Black Sea Region--History--12th century--Sources.
Black Sea Region--History--13th century--Sources.
Black Sea Region--History--Sources.
Byzantine Empire--Historiography.
Byzantine Empire--Relations--Kievan Rus.
Kievan Rus--History--862-1237--Sources.
Kievan Rus--Relations--Byzantine Empire.
Princeton subject headings:
Black Sea Region--History--12th century--Sources.
Black Sea Region--History--13th century--Sources.
Byzantine Empire--Historiography.
Byzantine Empire--Relations--Kievan Rus.
Kievan Rus--History--862-1237--Sources.
Kievan Rus--Relations--Byzantine Empire.