Columbia subject headings:
Kievan Rus--Foreign relations.
Kievan Rus--History--862-1237.
Kievan Rus--Politics and government.
Harvard subject headings:
Byzantine Empire--Foreign relations--Kievan Rus.
Igorʹ, Grand Duke of Kyïv, -945
Kievan Rus--Foreign relations--Byzantine Empire.
Kievan Rus--History--862-1237.
Kievan Rus--Kings and rulers.
Kievan Rus--Politics and government.
Olga, Grand Duchess of Kyïv, Saint, approximately 890-969
Princeton subject headings:
Byzantine Empire--Foreign relations--Kievan Rus.
Igorʹ, Grand Duke of Kyïv, -945.
Kievan Rus--Foreign relations--Byzantine Empire.
Kievan Rus--History--862-1237.
Kievan Rus--Kings and rulers.
Kievan Rus--Politics and government.
Olga, Grand Duchess of Kyïv, Saint, approximately 890-969.