Columbia subject headings:
Byzantine Empire--Civilization.
Byzantine Empire--Religious life and customs.
Byzantine Empire--Social life and customs.
Harvard subject headings:
Byzantine Empire--Church history.
Byzantine Empire--Civilization.
Byzantine Empire--Commerce.
Byzantine Empire--Social life and customs.
Fasts and feasts--Orthodox Eastern Church
Princeton subject headings:
Byzantine Empire--Civilization.
Byzantine Empire--Religious life and customs.
Byzantine Empire--Social life and customs.