Columbia subject headings:
Emperors--Rome--History.
Palaces--Italy--Rome--History.
Rome (Italy)--Buildings, structures, etc.
Rome--Kings and rulers--Dwellings.
Rome--Politics and government--30 B.C.-284 A.D.
Royal households--Dwellings--Rome.
Royal households--Rome--History.
Harvard subject headings:
Emperors--Rome
Rome--History--Empire, 30 B.C.-284 A.D.
Princeton subject headings:
Emperors--Rome.
Rome--History--Empire, 30 B.C.-284 A.D.