Otto I, Duke of Saxony (851–912) the Ottonian dynasty Otto I, Holy Roman Emperor (912–973) Otto II, Holy Roman Emperor (955–983) Otto III, Holy Roman Emperor (980–1002) Otto IV, Holy Roman Emperor (1175/1176–1218) Otto of Bamberg (1060/1061–1139), bishop and Catholic saint; Otto of Freising (c. 1114–1158), bishop and chronicler ...