Columbia subject headings:
Biography--11th century.
Conrad II, Holy Roman Emperor, approximately 990-1039.
Emperors--Biography.
Henry IV, Holy Roman Emperor, 1050-1106.
Harvard subject headings:
Biography--11th century
Conrad II, Holy Roman Emperor, approximately 990-1039.
Emperors--Biography.
Henry IV, Holy Roman Emperor, 1050-1106
Princeton subject headings:
Biography--11th century.
Conrad II, Holy Roman Emperor, approximately 990-1039.
Emperors--Biography.
Henry IV, Holy Roman Emperor, 1050-1106.