Adelaide requested this ruler to attack Berengar II of Italy in exchange for this man's hand in marriage.
The deeds of this ruler are chronicled in the second book of Widukind of Corveys' Three Books of Annals. At his greatest military victory, this ruler was assisted by Burchard III and Conrad the Red. He appointed his youngest brother Bruno as both Archbishop of Cologne and Duke of Lotharingia, and this man later faced a rebellion by his son (*) Liudolf. Adelaide requested this ruler to attack Berengar II of Italy in exchange for this man's hand in marriage. This ruler stopped the westward expansion of the Magyars at the Battle of Lechfeld, and was crowned by Pope John XII as Emperor. For 10 points, name this son of Henry the Fowler, the founder of the Holy Roman Empire.
The deeds of this ruler are chronicled in the second book of Widukind of Corveys' Three Books of Annals.
Otto the Great or Otto I