Columbia subject headings:
Great Britain--History, Military--55 B.C.-449 A.D.
Great Britain--History--Roman period, 55 B.C.-449 A.D.
Romans--Great Britain.
Harvard subject headings:
Great Britain--History--Roman period, 55 B.C.-449 A.D.
Princeton subject headings:
Great Britain--History--Roman period, 55 B.C.-449 A.D.