House of Nassau in the context of "Duchy of Nassau"

The House of Orange-Nassau (Dutch: Huis van Oranje-Nassau, pronounced [ˈɦœys fɑn oːˌrɑɲə ˈnɑsʌu]), also known as the House of Orange or rarely the Fourth House of Orange in comparison with the other noble houses that held the Principality of Orange, is the current reigning house of the Netherlands. A branch of the European House of Nassau, the house has played a central role in the politics and government of the Netherlands and elsewhere in Europe, particularly since William the Silent organised the Dutch Revolt against Spanish rule, which after the Eighty Years' War (1568–1648) led to an independent Dutch state. William III of Orange led the resistance of the Netherlands and Europe to Louis XIV of France and orchestrated the Glorious Revolution in England that established parliamentary rule. Similarly, Queen Wilhelmina of the Netherlands was instrumental in the Dutch resistance during World War II.

Several members of the house served during the Eighty Years war and after as stadtholder ("governor"; Dutch: stadhouder) during the Dutch Republic. However, in 1815, after a long period as a republic, the Netherlands became a monarchy under the House of Orange-Nassau.

William the Silent or William the Taciturn (Dutch: Willem de Zwijger; 24 April 1533 – 10 July 1584), more commonly known in the Netherlands as William of Orange (Dutch: Willem van Oranje), was the 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 1648. Born into the House of Nassau, he became Prince of Orange in 1544 and is thereby the founder of the Orange-Nassau branch and the ancestor of the monarchy of the Netherlands. In the Netherlands, he is also known as Father of the Fatherland (Latin: Pater Patriae; Dutch: Vader des Vaderlands).

A wealthy nobleman, William originally served the Habsburgs as a member of the court of Margaret of Parma, governor of the Spanish Netherlands. Unhappy with the centralisation of political power away from the local estates and with the Spanish persecution of Dutch Protestants, William joined the Dutch uprising and turned against his former masters. The most influential and politically capable of the rebels, he led the Dutch to several successes in the fight against the Spanish. Declared an outlaw by the Spanish king in 1580, he was assassinated by Balthasar Gérard in Delft in 1584.

Nassau Castle, located in Nassau, Rhineland-Palatinate, Germany and named after it, was a castle and the ancestrial seat of the House of Nassau and also its namesake, also it is the namesake of the historical Nassau realms of the County and Duchy of Nassau . The ruins of the castle are situated on a rock outcropping about 120 m (390 ft) above the Lahn River. The House of Nassau was an aristocratic dynasty among whose descendants are the present-day monarchy of the Netherlands and Luxembourg.