Columbia subject headings:
Art patronage--Congresses.
Art, Roman--Congresses.
Christian art and symbolism--To 500--Congresses.
Icons--Congresses.
Kings and rulers in art--Congresses.
Harvard subject headings:
Architecture, Early Christian--Rome--Congresses.
Art and state--Rome--Congresses.
Art patronage--Rome--Congresses.
Art, Early Christian--Rome--Congresses.
Christian art and symbolism--Rome--Congresses.
Princeton subject headings:
Architecture, Early Christian--Rome--Congresses.
Art and state--Rome--Congresses.
Art patronage--Rome--Congresses.
Art, Early Christian--Rome--Congresses.
Christian art and symbolism--Rome--Congresses.