Why was william the conqueror so important?

At the age of 8, William the Conqueror became duke of Normandy. Violence plagued his early reign, but with the help of King Henry I of France, William managed to survive the early years. After the Battle of Hastings, in 1066, he was crowned king of England. He never spoke English and was illiterate, but he had more influence on the evolution of the English language then anyone before or since. William ruled England until his death, on September 9, 1087, in Rouen, France.