After Charlemagne's death, Breton expansion intensified. In 850, the region was conquered by Nominoë, the ruler of Brittany, who invaded, among others, the towns of Nantes and Rennes. The following year, in the aftermath of the Battle of Jengland, the Breton March, with Nantes as its capital, was integrated into Brittany by the Treaty of Angers. The subsequent eighty years, however, were made difficult by the constant infighting between the Breton warlords, who promoted Viking invasions. From 919 to 937, the town was managed by the Vikings, who were defeated by Alain Barbe-Torte, the grandson of Alan the Great, the last king of Brittany.