Columbia subject headings:
Harvard subject headings:
Balkan Peninsula--History.
Romans--Balkan Peninsula.
Rome--History, Military.
Rome--History--Empire, 30 B.C.-284 A.D.
Princeton subject headings:
Balkan Peninsula--History.
Romans--Balkan Peninsula.
Rome--History, Military.
Rome--History--Empire, 30 B.C.-284 A.D.