Columbia subject headings:
Harvard subject headings:
Byzantine Empire--Politics and government--527-1081.
Constantine VII Porphyrogenitus, Emperor of the East, 905-959.
Legitimacy of governments--Byzantine Empire.
Power (Social sciences)--Byzantine Empire.
Romanus I Lecapenus, Emperor of the East, -948.
Princeton subject headings:
Byzantine Empire--Politics and government--527-1081.
Constantine VII Porphyrogenitus, Emperor of the East, 905-959.
Legitimacy of governments--Byzantine Empire.
Power (Social sciences)--Byzantine Empire.
Romanus I Lecapenus, Emperor of the East, -948.