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The Normandy region was created by the treaty of Saint-Clair-sur-Epte in 911 which gave the Scandinavian leader Rollon, the vast territory between the Seine and the North Sea. Since that date, Normandy’s northern past has been mythologized and celebrated, notably by the regionalist movement. At the end of the 1970s, the links between Normandy and Scandinavia were used as a pretext to set up new forms of cooperation, this time academic, then cultural and finally economic. The region of Lower Normandy then tried to carry out regional diplomacy, sometimes with the support of the Quai d’Orsay, sometimes against its will and without its help. The aim of this research is to establish whether in a centralized state like France, a region which in principle has no autonomy on a diplomatic level can nevertheless successfully implement real diplomatic practices.