Columbia subject headings:
John I Tzimisces, Emperor of the East, 925-976.
Nicephorus II Phocas, Emperor of the East, 912-969.
Harvard subject headings:
Byzantine Empire--History.
John I Tzimisces, Emperor of the East, 925-976.
Nicephorus II Phocas, Emperor of the East, 912-969.
Princeton subject headings: