Columbia subject headings:
Byzantine Empire--History--Irene, 797-802.
Irene, Empress of the East, 752?-803.
Harvard subject headings:
Byzantine Empire--History--Irene, 797-802.
Irene, Empress of the East, 752?-803.
Princeton subject headings:
Byzantine Empire--History--Irene, 797-802.
Byzantine Empire--Kings and rulers--Biography.
Irene, Empress of the East, 752?-803.