Columbia subject headings:
Harvard subject headings:
Emperors--Rome--History.
Historians--Germany
Mommsen, Theodor, 1817-1903
Rome--History
Princeton subject headings:
Mommsen, Theodor, 1817-1903.
Mommsen, Theodor, 1817-1903. Römische Kaisergeschichte.
Rome--History--Empire, 30 B.C.-476 A.D.--Historiography.