The House of Nassau is a European royal house that originated in the 11th century in the region of Nassau, now part of modern-day Germany. It gained prominence through various branches, including the House of Nassau-Weilburg and the House of Nassau-Siegen. Members of this house have played significant roles in the history of several countries, particularly in the Netherlands and Luxembourg. The most notable member of the House of Nassau is William of Orange, who led the Dutch revolt against Spanish rule in the 16th century. Today, the house continues to have a presence in European royalty, with connections to the current royal families of Luxembourg and the Netherlands.