Columbia subject headings:
Marcus Aurelius, Emperor of Rome, 121-180.
Rome--History--Empire, 30 B.C.-284 A.D.
Harvard subject headings:
Marcus Aurelius, Emperor of Rome, 121-180.
Rome--History--Empire, 30 B.C.-284 A.D.
Princeton subject headings:
Marcus Aurelius, Emperor of Rome, 121-180.
Rome--History--30 B.C.-284 A.D.