Answer:
Norman Conquest in the year 1066
Explanation:
The Norman Conquest of Anglo-Saxon England in the year 1066 was the event which completely changed the course of Anglo-Saxon culture, language and arts. Normans were originally Vikings or Norsemen who had settled in present day northern France (Normandy). After the death of Anglo-Saxon King Edward the Confessor, William the the Conqueror (Duke of Normandy) proclaimed himself the rightful heir of the throne, conquered Anglo-Saxon England and was crowned the King on 25th December 1066.
This conquest had many effects on all aspects of Anglo-Saxon culture, history, language, literature, arts, law, etc. It linked England directly with France and continental Europe which before the conquest was more closely linked with Scandinavia. Anglo-Saxon or Old English as an official language of court, law, literature, was replaced by Anglo-Norman. It was only in 13th century that English (now called Middle English) started to challenge Anglo-Norman. But now it was completely changed from Old English (Anglo-Saxon).