Columbia subject headings:
Byzantine Empire--Social conditions.
Circus--Byzantine Empire.
Circus--Rome.
Group games.
Rome--Social conditions.
Harvard subject headings:
Byzantine Empire--History
Chariot racing--Byzantine Empire.
Chariot racing--Rome.
Circus--Political aspects--Byzantine Empire.
Circus--Political aspects--Rome.
Princeton subject headings:
Byzantine Empire--Politics and government.
Rome--Politics and government.