Columbia subject headings:
Holy Roman Empire--History--843-1273.
Otto I, Holy Roman Emperor, 912-973.
Harvard subject headings:
Arnulf, Holy Roman Emperor, 850-899
Holy Roman Empire--History--843-1273--Sources.
Inscriptions--Rome.
Otto I, Holy Roman Emperor, 912-973
Scribes--Rome--History.
Princeton subject headings:
Arnulf, Holy Roman Emperor, 850-899.
Holy Roman Empire--History--843-1273.
Otto I, Holy Roman Emperor, 912-973.