Columbia subject headings:
Rome--History--Empire, 30 B.C.-284 A.D.
Trajan, Emperor of Rome, 53-117.
Harvard subject headings:
Rome--History--Empire, 30 B.C.-284 A.D.
Trajan, Emperor of Rome, 53-117.
Princeton subject headings:
Rome--History--Empire, 30 B.C.-284 A.D.
Trajan, Emperor of Rome, 53-117.