Columbia subject headings:
Political violence--Greece--History--To 1500--Congresses.
Political violence--Rome--History--To 1500--Congresses.
Harvard subject headings:
Political violence--Greece--History--To 1500--Congresses.
Political violence--Rome--History--To 1500--Congresses.
Princeton subject headings:
Political violence--Greece--History--To 1500--Congresses.
Political violence--Rome--History--To 1500--Congresses.