Final answer:
The Norman Conquest in 1066 led by William the Conqueror influenced the English language with French culture and introduced numerous French words.
Explanation:
The event in 1066 that caused the English language to be influenced by French culture was the Norman Conquest led by William the Conqueror. After the conquest, French became the language of the English Church and Latin, leading to a linguistic shift. Many French words came into English after the Norman Conquest, especially related to warfare and military terminology.
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