Columbia subject headings:
Emperors--Rome--Travel--Germany--Mainz (Rhineland-Palatinate)
Mainz (Rhineland-Palatinate, Germany)--History.
Romans--Germany--Mainz (Rhineland-Palatinate)--History.
Harvard subject headings:
Emperors--Rome
Emperors--Travel--Germany--Mainz (Rhineland-Palatinate).
Mainz (Rhineland-Palatinate, Germany)--History
Romans--Germany (West)--Mainz (Rhineland-Palatinate)--History.
Romans--Germany--Mainz (Rhineland-Palatinate)
Princeton subject headings:
Germany--History--To 843.
Mainz (Rhineland-Palatinate, Germany)--Antiquities, Roman.
Mainz (Rhineland-Palatinate, Germany)--History.
Romans--Germany (West)--Mainz (Rhineland-Palatinate).