When Bernard of Italy challenged this man's right 
When Bernard of Italy challenged this man's right to the throne, he had Bernard blinded, a procedure from which Bernard died. A conspiracy against this man was successful at exiling his wife, Judith of Bavaria. This man's mother was Hildegard, and his brothers Charles the Younger and Pippin of Italy died before he became king. One of this man's sons defeated the other after the arrival of Count Guerin of Chalon in the Battle of Fontenoy. This man reformed the divisions in his empire with the Ordinatio imperii. After this man's death, his land was divided in the Treaty of Verdun among Lothair, Louis the German, and Charles the Bald. For 10 points, name this fourth monarch of the Carolingian Empire, the grandson of Pepin the Short and the son of Charlemagne.
When Bernard of Italy challenged this man's right to the throne, he had Bernard blinded, a procedure from which Bernard died.
Louis the Pious [or Louis I of France; or Louis the Debonair; or Louis the Fair]