Columbia subject headings:
Slavery--Greece--History.
Slavery--Rome--History.
Slaves--Emancipation--Greece.
Slaves--Emancipation--Rome.
Harvard subject headings:
Freed persons--Greece--History.
Freed persons--Rome.
Slavery--Greece--History
Slavery--Rome
Princeton subject headings:
Slavery--Greece--History.
Slavery--Rome--History.
Slaves--Emancipation--Greece.
Slaves--Emancipation--Rome.