 In 893, at the age of 14, Charles was crowned by a faction opposed to the rule of Odo at the Reims Cathedral, becoming monarch of West Francia only after the death of Odo in 898.In 911, a group of Vikings led by Rollo besieged Paris and Chartres.After a victory near Chartres on 26 August, Charles decided to negotiate with Rollo, resulting in the Treaty of Saint-Clair-sur-Epte which created the Duchy of Normandy.