Treaty of Verdun — Birth of France and Germany
When Louis the Pious, Charlemagne's only surviving son, died in 840, his three surviving sons plunged immediately into civil war. Lothair I, the eldest, held the title of Emperor and claimed supremacy; his brothers Charles the Bald (West Francia) and Louis the German (East Francia) allied against him. Their military stalemate was prefaced by a remarkable diplomatic ceremony: at Strasbourg in February 842, Charles and Louis swore mutual oaths of support — Charles in the Rhenish Frankish dialect so Louis's troops could understand, Louis in proto-Romance so Charles's troops could understand. The Oaths of Strasbourg are the oldest surviving texts in Old French and Old High German, making them linguistic foundation documents of two modern nations. The Treaty of Verdun, concluded in August 843, formalized the tripartite division. Charles the Bald received the western portion — roughly modern France west of the Rhône and Saône — and is considered the founding monarch of the Capetian tradition that ruled France until the Revolution. Louis the German received the eastern portion — roughly modern Germany east of the Rhine — and is the progenitor of the German royal tradition. Lothair retained the title of Emperor but received only the 'Middle Kingdom': a long strip running from the Low Countries through Burgundy and Provence into Italy, a geographically incoherent realm with no natural boundaries or cultural unity. The treaty's long-term significance is immense. It drew a line across the map of Europe that broadly follows the Romance/Germanic linguistic divide still visible today: the French-German border, the Swiss linguistic regions, the Belgian linguistic frontier all trace back to the tensions created at Verdun. The Middle Kingdom, lacking coherent identity, fragmented further: Burgundy, Provence, Lorraine (Lothringen — 'Lothar's kingdom'), and Italy became contested territories that France and Germany fought over repeatedly, with Alsace-Lorraine remaining a casus belli as late as 1940. The treaty also had immediate military consequences. The fragmented Carolingian successor kingdoms were individually far weaker than the unified empire, and Viking raids intensified dramatically in the 840s–880s precisely because the Franks could no longer mount coordinated defense. Paris itself was besieged in 845 (the Danes were paid 7,000 pounds of silver to leave) and again in 885–886 with a fleet of 700 ships. The grant of Normandy to Rollo in 911 was a direct consequence of the strategic weakness the Verdun division created. The Holy Roman Empire that emerged from Lothair's line would plague European politics for a millennium — its German emperors perpetually drawn into Italian adventures, its borders never clearly defined, its authority contested by every Pope. Voltaire's quip that it was 'neither holy, nor Roman, nor an empire' pointed back to its confused origins in the aftermath of Verdun. In breaking up Charlemagne's realm, his grandsons inadvertently created the plural, fragmented Europe of competing nation-states that defined the medieval and modern periods.
- Year: 843 CE
- Category: Political
