Treaty of Saint-Clair-sur-Epte
The Treaty of Saint-Clair-sur-Epte, between Charles the Simple (King Charles III of France) and Rollo, the leader of the Vikings, was signed in autumn 911. The treaty permitted the Normans to settle in Neustria in return for their protection of Charles' kingdom from any new invasion by the "northmen". No written records survive concerning the creation of the Duchy of Normandy.
In 911, a group of Vikings led by Rollo attacked Paris before laying siege to Chartres. Appeals for help from the Bishop of Chartres, Joseaume, were answered by Robert, Marquis of Neustria; Richard, Duke of Burgundy; and Manasses, Count of Dijon. On 20 July 911, at the Battle of Chartres, they defeated Rollo despite the absence of many French barons and of Charles the Simple. After the Frankish victory near Chartres on 26 August, Charles decided to negotiate with Rollo. The talks, led by Hervé, the Archbishop of Reims, resulted in the Treaty of Saint-Clair-sur-Epte. The treaty granted Rollo and his soldiers all the land between the river Epte and the sea "in freehold and good money". In addition, it granted him Brittany "for his livelihood"[clarification needed]. At the time, Brittany was an independent country which France had unsuccessfully tried to conquer. In exchange, Rollo guaranteed the king his loyalty, which involved military assistance for the protection of the kingdom. As a token of his goodwill, Rollo also agreed to be baptised and to marry Gisela, a presumed illegitimate daughter of Charles.
The territory covered by the treaty corresponds to the northern part of today's Upper Normandy down to the Seine, but the territory of the Vikings would eventually extend west beyond the Seine to form the Duchy of Normandy, so named because of the Norsemen who ruled it.
The treaty was entered into[clarification needed] after the death of Alan I, King of Brittany and while another group of Vikings occupied Brittany. Around 937 Alan I's son Alan II returned from England to expel those Vikings from Brittany in a war that was concluded in 939. During this period the Cotentin Peninsula was lost by Brittany and gained by Normandy.
- Francois Neveux. A Brief History of The Normans. Constable and Robinson Ltd. 2006; p. 62.
- Timothy Baker, The Normans New York: Macmillan, 1966.
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