Claim: Dutch leaders Louis and Henry of Nassau, younger brothers of William the Silent, Prince of Orange, died in the Battle of Mookerheyde.
Evidence: William the Silent (24 April 1533 – 10 July 1584), also known as William the Taciturn (translated from Dutch: Willem de Zwijger), or 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 (1568–1648) and resulted in the formal independence of the United Provinces in 1581. In early 1565, a large group of lesser noblemen, including William's younger brother Louis, formed the Confederacy of Noblemen. Their decisive victory in the Battle of Mookerheyde in the south east, on the Meuse embankment, on 14 April cost the lives of two of William's brothers, Louis and Henry. Louis of Nassau (Dutch: Lodewijk van Nassau, January 10, 1538 – April 14, 1574) was the third son of William, Count of Nassau and Juliana of Stolberg, and the younger brother of Prince William of Orange Nassau. That spring, Louis, along with his youngest Nassau brother Henry and the Elector Palatine's son Christopher of Bavaria, crossed the Meuse with their army. Henry of Nassau, count of Nassau-Dillenburg, (15 October 1550 in Dillenburg – 14 April 1574 in Mook) was the youngest brother of William I of Orange-Nassau.