Columbia subject headings:
Harvard subject headings:
Byzantine Empire--History--Constantine VI, 780-797.
Byzantine Empire--History--Irene, 797-802.
Byzantine Empire--History--Leo IV, 775-780.
Constantine VI, Emperor of the East, 771-
Irene, Empress of the East, 752?-803.
Leo IV, Emperor of the East, 750-780.
Princeton subject headings:
Byzantine Empire--Foreign relations--527-1081.
Byzantine Empire--Politics and government--527-1081.
Constantine VI, Emperor of the East, 771-
Emperors--Byzantine Empire--Biography.
Empresses--Byzantine Empire--Biography.
Irene, Empress of the East, 752?-803.