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.