Columbia subject headings:
Henry II, Holy Roman Emperor, 973-1024.
Holy Roman Empire--History--843-1273.
Otto III, Holy Roman Emperor, 980-1002.
Harvard subject headings:
Henry II, Holy Roman Emperor, 973-1024--Congresses.
Holy Roman Empire--History--Henry II, 1002-1024.
Holy Roman Empire--History--Otto III, 983-1002.
Otto III, Holy Roman Emperor, 980-1002--Congresses.
Princeton subject headings:
Henry II, Holy Roman Emperor, 973-1024.
Holy Roman Empire--History--843-1273.
Otto III, Holy Roman Emperor, 980-1002.