Columbia subject headings:
Harvard subject headings:
Aachener Ottonenkodex--Illustrations.
Bolesław I, King of Poland, 966 or 967-1025--Art.
Catholic Church. Archdiocese of Gniezno (Poland)--History.
Holy Roman Empire--History--Saxon House, 919-1024.
Hungary--History--896-1301
Otto III, Holy Roman Emperor, 980-1002--Art.
Poland--History--Boleslaus I, 992-1025
Princeton subject headings:
Aachener Ottonenkodex--Illustrations.
Bolesław I, King of Poland, 966 or 967-1025--Art.
Catholic Church. Archdiocese of Gniezno (Poland)--History.
Holy Roman Empire--History--Saxon House, 919-1024.
Hungary--History--1000-1699.
Hungary--History--894-1000.
Otto III, Holy Roman Emperor, 980-1002--Art.
Poland--Church history.
Poland--History--Boleslaus I, 992-1025.