Columbia subject headings:
Emperors--Rome--Biography--Congresses.
Rome--History--Trajan, 98-117--Congresses.
Trajan, Emperor of Rome, 53-117--Congresses.
Harvard subject headings:
Emperors--Rome--Biography--Congresses.
Rome--History--Trajan, 98-117--Congresses.
Trajan, Emperor of Rome, 53-117--Congresses.
Princeton subject headings:
Emperors--Rome--Biography--Congresses.
Rome--History--Trajan, 98-117--Congresses.
Trajan, Emperor of Rome, 53-117--Congresses.