Columbia subject headings:
Art, Roman.
Emperors--Rome--Biography.
Rome--Antiquities.
Rome--Buildings, structures, etc.
Rome--History--Trajan, 98-117.
Trajan, Emperor of Rome, 53-117.
Harvard subject headings:
Architecture, Roman.
Emperors--Rome--Biography
Rome--Antiquities.
Rome--History--Trajan, 98-117.
Trajan, Emperor of Rome, 53-117.
Princeton subject headings:
Rome--History--Trajan, 98-117.
Trajan, Emperor of Rome, 53-117.