Columbia subject headings:
Byzantine Empire--Politics and government--1081-1453.
Byzantine Empire--Politics and government--527-1081.
Harvard subject headings:
Byzantine Empire--History--1081-1453--Sources.
Byzantine Empire--History--1081-1453.
Byzantine Empire--History--527-1081--Sources.
Byzantine Empire--History--527-1081.
Byzantine Empire--Politics and government
Insurgency--Byzantine Empire--History--Sources.
Insurgency--Byzantine Empire.
Princeton subject headings:
Byzantine Empire--Politics and government--1081-1453.
Byzantine Empire--Politics and government--527-1081.