Kingdom of Italy. He also received the central regions from Flanders through the Rhineland and Burgundy as king of Middle Francia. Reign in the West Shortly after Verdun, Charles went on to an unsuccessful campaign against Brittany, on the return from which he signed the Treaty of Coulaines with his nobility and clergy. After that, the first years of his reign, up to the death of Lothair I in 855, were comparatively peaceful. During these years the three brothers continued the system of "confraternal government", meeting repeatedly with one another, at Koblenz (848), at Meerssen (851), and at Attigny (854). In 858, Louis the German, invited by disaffected nobles eager to oust Charles, invaded the West Frankish kingdom. Charles was so unpopular that he was unable to summon an army, and he fled to Burgundy. He was saved only by the support of the bishops, who refused to crown Louis the German king, and by the fidelity of the Welfs, who were related to his mother, Judith. In 860, he in his turn tried to seize the kingdom of his nephew, Charles of Provence, but was repulsed. On the death of his nephew Lothair II in 869, Charles tried to seize Lothair's dominions by having himself consecrated as King of Lotharingia at Metz, but he was compelled to open negotiations when Louis found support among Lothair's former vassals. Lotharingia was partitioned between Charles and Louis in the resulting treaty (870). Besides these family disputes, Charles had to struggle against repeated rebellions in Aquitaine and against the Bretons. Led by their chiefs Nomenoë and Erispoë, who defeated the king at the Battle of Ballon (845) and the Battle of Jengland (851), the Bretons were successful in obtaining a de facto independence. Charles also fought against the Vikings, who devastated the country of the north, the valleys of the Seine and Loire, and even up to the borders of Aquitaine. At the Vikings' successful siege and sack of Paris in 845 and several times thereafter Charles was forced to purchase their retreat at a heavy price. Charles led various expeditions against the invaders and, by the Edict of Pistres of 864, made the army more mobile by providing for a cavalry element, the predecessor of the French chivalry so famous during the next 600 years. By the same edict, he ordered fortified bridges to be put up at all rivers to block