Middle English External History. History of the English Language. Norman Invasion (1066). Norman Conquest of England (1066) signals the shift from Old English to Middle English.
History of the English Language
Normans (Northmen)— Like the Scandinavians who raided England these are Vikings who settle in Normandy in 9th - 10th centuries.
Rollo (first Duke of Normandy) establishes treaty with French King (Charles the Simple) in 912 giving them official possession of the land in what is present day Normandy.