1343), the elder son of Otto I, Count of Nassau. His son Otto II, Count of Nassau-Siegen ruled also in Dillenburg. In 1328, John, Count of Nassau-Dillenburg died unmarried and childless, and Dillenburg fell to Henry I of Nassau-Siegen. For counts of Nassau-Siegen in between 1343 and 1606, see "Counts of Nassau-Dillenburg" above. Netherland Nassaus/Orange-Nassau The House of Orange-Nassau stems from the elder branch of the Ottonian Line. The connection was via Engelbert I, who offered his services to the Duke of Burgundy, married in 1403 Johanna van Polanen, the heiress of the barony of Breda, the lordship of den Lek and other lands in the duchy of Brabant at the mouth of the Rhine delta and the Scheldt river. As the Scheldt was the main trade artery in the Burgundian/Habsburg Netherlands during the time, the Netherand Nassaus benefitted from the commerce. These lands formed the core of the Nassau's Dutch possessions. The importance of the Nassaus grew throughout the 15th and 16th century. Henry III of Nassau-Breda was appointed stadtholder of Holland, Zeeland and Utrecht by Emperor Charles V in the beginning of the 16th century. Henry married Claudia of Châlon-Orange from French Burgundy in 1515. Their son René of Chalon inherited in 1530 the independent and sovereign Principality of Orange from his mother's brother, Philibert of Châlon. As the first Nassau to be the Prince of Orange, René could have used "Orange-Nassau" as his new family name. However, his uncle, in his will, had stipulated that René should continue the use of the name Châlon-Orange. At René's death in 1544, he left all his lands to his cousin William of Nassau-Dillenburg, including the sovereign principality of Orange. This "William I of Orange", in English better known as William the Silent, became the founder of the House of Orange-Nassau and the leader of the Dutch Revolt that lead to the formation of the Dutch Republic as a separate sovereign nation. Within the government of the Dutch Republic, The Prince of Orange was also not just another noble among equals in the Netherlands. First, he was the traditional leader of the nation in war and in rebellion against Spain. He was uniquely able to transcend the local issues of the cities, towns and provinces. He was also a sovereign ruler in his own right (see Prince of Orange article). This gave him a great deal of prestige, even in a