Louis II of Italy

Map of where Emperor Louis II issued charters

The division of Lothair's dominions, by which he obtained no territory outside Italy, aroused his discontent, and in 857 he allied himself with Louis the German against his own brother Lothair II, and King Charles the Bald. But after Louis had secured the election of Pope Nicholas I in 858, he became reconciled with his brother, and received some lands south of the Jura mountains in return for assistance given to Lothair in his efforts to obtain a divorce from his wife, Teutberga.

In 863, upon the death of his brother Charles, Louis received the kingdom of Provence, and in 864 came into collision with Pope Nicholas I over his brother's divorce. The archbishops, who had been deposed by Nicholas for proclaiming this marriage invalid, obtained the support of the emperor, who reached Rome with an army in February 864; but, having been seized with fever, he made peace with the pope and left the city.

In his efforts to restore order in Italy, Louis met with considerable success both against Italy's turbulent princes and against the Aghlabids who were ravaging southern Italy. In 866, after issuing a call for assistance to fight the Muslims,[5] he routed these invaders, but could not follow up his successes owing to the lack of a fleet. So in 869 he made alliance with the eastern emperor, Basil I, who sent him ships to assist in the capture of Bari, capital of the Emirate of Bari, which succumbed in 871.[6]

Meanwhile, his brother Lothair had died in 869, and owing to his detention in southern Italy, Louis failed to prevent the partition of Lotharingia between Louis the German and Charles the Bald. Some jealousy between Louis and Basil followed the victory at Bari, and in reply to an insult from the eastern emperor Louis attempted to justify his right to the title "emperor of the Romans."[7]

He had withdrawn into Benevento to prepare for a further campaign when he was treacherously attacked in his palace, robbed and imprisoned by Adelchis, prince of Benevento, in August 871. The capture of Louis was lamented in a contemporary short poem, the Rythmus de captivitate Ludovici imperatoris. The landing of fresh bands of Aghlabids compelled Adelchis to release his prisoner a month later, and Louis was forced to swear he would take no revenge for this injury, nor ever enter Benevento with an army. Returning to Rome, he was released from his oath, and was crowned a second time as emperor by Pope Adrian II on 18 May 872.

Louis' gravestone in Milan.

Then Louis won further successes against the Aghlabids, relieving the siege of Salerno and driving them from Capua, but the emperor's attempts to punish Adelchis were not very successful. Returning to northern Italy, he died, near Ghedi, in what is now the province of Brescia, on 12 August 875, having named as his successor in Italy his cousin Carloman, son of Louis the German. Louis was buried in the Basilica of Sant'Ambrogio in Milan.