1. ( "the Conqueror" ) 1027-87, duke of Normandy 1035-87; king of England 1066-87 (son of Robert I, duke of Normandy).
2. Also, Willem I . ( William I of Orange ) ( "the Silent" ) 1533-84, Dutch leader, statesman, and revolutionary leader born in Germany: prince of Orange 1544-84; count of Nassau 1559-84; 1st stadholder of the United Provinces of the Netherlands 1578-84.
3. Also, Wilhelm I . ( Wilhelm Friedrich Ludwig ) 1797-1888, King of Prussia 1861-88; emperor of Germany 1871-88 (brother of Frederick William IV).