Columbia subject headings:
Harvard subject headings:
Byzantine Empire--Foreign relations--527-1081.
Byzantine Empire--Foreign relations--Holy Roman Empire--Sources.
Byzantine Empire--Foreign relations--Kievan Rus.
Byzantine Empire--Foreign relations--Russia--Sources.
Byzantine Empire--History--John I Tzimisces, 969-976--Sources.
Holy Roman Empire--Foreign relations--Byzantine Empire--Sources.
John I Tzimisces, Emperor of the East, 925-976.
Kievan Rus--Foreign relations--Byzantine Empire.
Russia--Foreign relations--Sources.
Princeton subject headings:
Byzantine Empire--History--John I Tzimisces, 969-976--Sources.
John I Tzimisces, Emperor of the East, 925-976.