Columbia subject headings:
Emperors--Rome--Biography.
Rome--History--Trajan, 98-117.
Rome--Kings and rulers--Biography.
Trajan, Emperor of Rome, 53-117.
Harvard subject headings:
Emperors--Rome--Biography
Rome--History--Trajan, 98-117.
Rome--Kings and rulers--Biography.
Trajan, Emperor of Rome, 53-117
Princeton subject headings:
Biographies.
Emperors--Rome--Biography.
Rome--History--Trajan, 98-117.
Rome--Kings and rulers--Biography.
Trajan, Emperor of Rome, 53-117.