Columbia subject headings:
Harvard subject headings:
Balkan Peninsula--Church history--Congresses.
Balkan Peninsula--Kings and rulers--Congresses.
Byzantine Empire--Church history--Congresses.
Byzantine Empire--Kings and rulers--Congresses.
Christian hagiography--Congresses.
Saints--Cult--Balkan Peninsula--Congresses.
Saints--Cult--Byzantine Empire--Congresses.
Princeton subject headings:
Balkan Peninsula--Church history--Congresses.
Balkan Peninsula--Kings and rulers--Congresses.
Byzantine Empire--Church history--Congresses.
Byzantine Empire--Kings and rulers--Congresses.
Christian hagiography--Congresses.
Christian saints--Cult--Balkan Peninsula--Congresses.
Christian saints--Cult--Byzantine Empire--Congresses.