Principality of Orange in the context of "Orange, Vaucluse"

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.

Prince of Orange (or Princess of Orange if the holder is female) is a title associated with the sovereign Principality of Orange, in what is now southern France and subsequently held by the stadtholders of, and then the heirs apparent of, the Netherlands.

The title "Prince of Orange" was created in 1163 by Holy Roman Emperor Frederick Barbarossa, by elevating the county of Orange to a principality, in order to bolster his support in that area in his conflict with the Papacy. The title and land passed to the French noble houses of Baux, in 1173, and of Chalons, in 1393, before arriving with René of Nassau in 1530. The principality then passed to René's cousin, the German-born nobleman from then Spanish Netherlands, William (known as "the Silent"), in 1544. Subsequently, William led a successful Dutch revolt against Spain; however, with independence, the new country became a decentralized republic rather than a unitary monarchy.

The War of the Reunions (1683–84) was a conflict between France, Spain and the Holy Roman Empire, with limited involvement by Genoa. It can be seen as a continuation of the War of Devolution (1667–1668) and the Franco-Dutch War (1672–1678), which were driven by Louis XIV's determination to establish defensible boundaries along France's northern and eastern borders.

Despite the peace established by the 1678 Treaty of Nijmegen, Louis retained a large army, an action extremely unusual in the period. In 1681, his troops seized Strasbourg and in 1682 occupied the Principality of Orange, then a possession of William of Orange. When hostilities began in 1683, French support for the Ottomans in their war with Austria allowed Louis to capture Luxembourg and consolidate his position in Alsace.

The House of Baux is a noble family from the south of France. It was one of the richest and most powerful families of medieval Provence, known as the 'Race d’Aiglon'. They were independent lords as castellans of Les Baux and Arles and wielded very considerable authority at the local level. They held important fiefs and vast lands, including the principality of Orange.

In Old French: baux (and in Provençal-Occitan, li baou) is the word for 'cliffs, escarpment'. In its use as the family name, it refers to the natural fortress on which the family built their castle, the Château des Baux and the village that surrounded it. The escarpment provided a raised and protected mountain valley that protected their food supply; the natural ridge of the Alpilles allowed control of all the approaches to the citadel of Les Baux-de-Provence and the surrounding countryside, including the passage up and down the Rhone, and the approaches from the Mediterranean. Together, these natural advantages made the fortress impervious to the military technology of the time.

The Comtat Venaissin (French pronunciation: [kɔ̃ta vənɛsɛ̃]; Occitan: lo Comtat Venaicin; 'County of Venaissin'), often called the Comtat for short, was a part of the Papal States from 1274 to 1791, in what is now the Provence-Alpes-Côte d'Azur region of Southern France.

The region was an enclave within the Kingdom of France, comprising the area around the city of Avignon (itself always a separate comtat) roughly between the Rhône, the Durance and Mont Ventoux, and a small exclave located to the north around the town of Valréas purchased by Pope John XXII. The Comtat also bordered (and mostly surrounded) the Principality of Orange. The region is still known informally as the Comtat Venaissin, although this no longer has any political meaning.

Chalon-Arlay was a noble house of the Holy Roman Empire. They were the lords of Arlay in the county of Burgundy and a cadet branch of the ruling house of the county, the House of Ivrea. The founder of the house was John I of Chalon-Arlay, fifth son of John, Count of Chalon. When John III, lord of Arlay, married Mary de Baux, princess of Orange, the House acquired the principality of Orange.

For more details, and a family tree, see below.