The pope continued to write to Charles, asking for help which never came. In February 882, Charles convened a council in Ravenna where Guy and his nicer uncle, Guy of Camerino, the pope, and Charles made peace with a promise to restore the papal lands. A letter in March from the pope to Charles let it be known that the promise to restore land was broken. Fortunately for the pope, Guy died not long after, and was succeeded by his uncle, Guy of Camerino, who was happy to restore the papal lands. (Guy would later become Holy Roman Emperor Guy III.)
Charles was more focused on his own concerns, like building a new palace in Alsace. Aachen was the center of Carolingian power and culture since the time of Charlemagne, but Sélestat in Alsace was closer to the center of Carolingian domains by Charles' time. He also may have asked Notker the Stammerer to write the biography of Charlemagne, the Gesta Karoli Magna ("Deeds of Charles the Great"), since the work is dedicated to Charles, and Notker was known to advise him occasionally.
Not long before, in England, Alfred the Great had defeated the Great Heathen Army in 878, and the survivors had fled to the Low Countries where they became a problem for Charles the Fat's brother, Louis the Younger. He had some success fighting them, but died on 20 January 882, leaving his throne to Charles. This brought the entirety of the East Frankish kingdom, which had been split after the Treaty of Verdun, together again. (It is interesting that Verdun was necessary because three brothers could not get along, while Charles and his two brothers under similar circumstances were able to support each other a generation later with none of the hostility.)
Charles was not entirely useless when it came to enemies. Vikings were a problem for the continent as well as England, and he met with Viking leaders Godfrid and Sigfred after they were besieged by a combined military force all of East Francia. Godfrid converted to Christianity and married Gisela, daughter of Lothair II of Lotharingia. Sigfred was paid off to leave (see illustration). Godfrid was later ambushed and killed by Charles for fear of him relapsing and attacking again.
In December 884, Carloman II of West Francia (France) died, and the throne was offered to Charles, who accepted. He now was king of West Francia, East Francia, Aquitaine, Alemannia, Italy, and Emperor of the Carolingian Empire.
But then, Sigfred returned in 885, sailing a fleet up the Seine to attack Paris, and things went poorly. I'll explain next time.