The House of Nassau-Dillenburg is a branch of the larger House of Nassau, a noble family from the Netherlands. It originated in the 16th century and is known for its significant role in European history, particularly during the Reformation and the Eighty Years' War. The family produced several notable figures, including William of Orange, who played a crucial role in the fight for Dutch independence. The house is associated with the town of Dillenburg in present-day Germany, where it held considerable influence. Members of the House of Nassau-Dillenburg often intermarried with other royal families, strengthening their political alliances across Europe. Their legacy continues to be felt in various regions, particularly in the Netherlands.