Columbia subject headings:
Portraits, Ancient--Congresses.
Portraits, Byzantine--Congresses.
Portraits, Roman--History--Congresses.
Harvard subject headings:
Portraits, Ancient--Congresses.
Portraits, Byzantine--Congresses.
Portraits, Roman--History--Congresses.
Princeton subject headings:
Portraits, Ancient--Congresses.
Portraits, Byzantine--Congresses.
Portraits, Roman--History--Congresses.