Founding of the Duchy of Normandy

Also called: Treaty of Saint-Clair-sur-Epte

In 911 King Charles III of West Francia granted the lower Seine to the Norse leader Rollo, creating the Duchy of Normandy.

To stop the Norsemen who sailed up the Seine and threatened even Paris, King Charles III (the Simple) of West Francia granted the lands around Rouen to their leader Rollo at Saint-Clair-sur-Epte in 911. Rollo was baptised, became the king’s vassal and undertook to keep other Vikings out. The Normans soon adopted French and Christianity, and the Duchy of Normandy raised a strong knightly class that became the springboard for the conquest of England in 1066 and the advance into southern Italy. In the same year (911) on the Korean peninsula, Gung Ye renamed his state Taebong.