linguistic:paraphrasing
Decline (877–888)

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 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 of Vienne founded the Kingdom of Lower Burgundy in Provence.

In 881, Charles the Fat was crowned emperor while Louis III of Saxony and Louis III of Francia died the following year. Saxony and Bavaria were united with Charles the Fat's Kingdom, and Francia and Neustria were granted to Carloman of Aquitaine who also conquered Lower Burgundy. Carloman died in a hunting accident in 884 after a tumultuous and ineffective reign, and his lands were inherited by Charles the Fat, effectively recreating the empire of Charlemagne.

Charles, suffering what is believed to be epilepsy, could not secure the kingdom against Viking raiders, and after buying their withdrawal from Paris in 886 was perceived by the court as being cowardly and incompetent. The following year his nephew Arnulf of Carinthia, the illegitimate son of King Carloman of Bavaria, raised the standard of rebellion. Instead of fighting the insurrection, Charles fled to Neidingen and died the following year in 888, leaving a divided entity and a disorderly succession.