The Empire, after the death of Charles the Bald, was under attack in the north and west by the Vikings and was facing internal struggles from Italy to the Baltic, from Hungary in the east to Aquitaine in the west. Charles the Bald died in 877 crossing the Pass of Mont Cenis, and was succeeded by his son, Louis the Stammerer as King of the Western Franks, but the title of Holy Roman Emperor lapsed. Louis the Stammerer was physically weak and died two years later, his realm being divided between his eldest two sons: Louis III gaining Neustria and Francia, and Carloman gaining Aquitaine and Burgundy. The Kingdom of Italy was finally granted to King Carloman of Bavaria, but a stroke forced him to abdicate Italy to his brother Charles the Fat and Bavaria to Louis of Saxony. Also in 879, Boso, Count of Arles founded the Kingdom of Lower Burgundy in Provence.