Magdalena of Nassau-Dillenburg's brother lead a revolt that set off what war?
Magdalena of Nassau-Dillenburg:  Magdalena was a sister of William the Silent. William the Silent: William I, Prince of Orange (24 April 1533 – 10 July 1584), also widely known as William the Silent or William the Taciturn (translated from Dutch: "Willem de Zwijger" ), or more commonly known as William of Orange (Dutch: "Willem van Oranje" ), was the main leader of the Dutch revolt against the Spanish Habsburgs that set off the Eighty Years' War and resulted in the formal independence of the United Provinces in 1581.
the Eighty Years' War