Columbia subject headings:
Civil war.
Rome--History--Civil War, 49-45 B.C.
Rome--History--Empire, 30 B.C.-284 A.D.
Harvard subject headings:
Cicero, Marcus Tullius
Rome--History--Civil War, 49 B.C.-45 B.C.
Rome--History--Civil War, 49 B.C.-45 B.C.--Literature and the war.
Rome--History--Empire, 30 B.C.-284 A.D.
Rome--In literature.
Princeton subject headings: