Columbia subject headings:
Harvard subject headings:
Christian art and symbolism--Byzantine Empire--Congresses.
Christian art and symbolism--Russia--Congresses.
Monasteries--Byzantine Empire--Congresses.
Monasteries--Russia--Congresses.
Sacred space--Byzantine Empire--Congresses.
Sacred space--Russia--Congresses.
Princeton subject headings:
Sacred space--Byzantine Empire.
Sacred space--Russia.