William I of Orange-Nassau , ( April 24 , 1533 â `` July 10 , 1584 ) was an important leader of the Dutch rebellion against the Spanish in the Eighty Years ' War . William I , Prince of Orange ( 24 April 1533 â `` 10 July 1584 ) , also widely known as William the Silent , or simply William of Orange , was the main leader of the Dutch revolt against the Spanish that set off the Eighty Years ' War and resulted in the formal independence of the United Provinces in 1648 .