Original: William I ( about 1027 or 1028 9 September 1087 ) , better known as William the Conqueror ( ) , was Duke of Normandy from 1035 and King of England from late 1066 to his death .
Simplified: William I of England ( c. 1027 - September 9 1087 ) , also known as William the Conqueror , was King of England from 1066 until 1087 .