Frederick Henry, Prince of Orange in the context of "'s-Hertogenbosch"

The Oranjezaal refers to a painted ballroom in the royal palace Huis ten Bosch in The Hague. It was once, together with its neighboring Chinese room, part of the first national museum of the Netherlands founded in 1800 called the Nationale Konst-Gallery. The supervisor Cornelis Sebille Roos appointed Jan Gerard Waldorp as the first custodian and curator to receive visitors (for 6 stuivers) and explain the collection.

The Oranjezaal or Orange room was commissioned upon the death of Frederick Henry, Prince of Orange in 1647 and was built during the years 1648-1651 by Jacob van Campen under the direction of Constantijn Huygens and Amalia van Solms. The painters were chosen as the best of the Netherlands, north and south, who painted in the Baroque style of Rubens, and were mostly of the Catholic faith. Therefore the total of 31 paintings decorating the room from floor to ceiling, are rather more typical of Flemish Baroque painting than Dutch Golden Age painting. Over a century later the room became part of the first national museum of the Netherlands, but it is not normally open to the public.

Henri de La Tour d'Auvergne, vicomte de Turenne (11 September 1611 – 27 July 1675), commonly known as Turenne (French: [tyʁɛn]), was a French general and one of only six marshals to have been promoted Marshal General of France. The most illustrious member of the La Tour d'Auvergne family, his military exploits over his five-decade career earned him a reputation as one of the greatest military commanders in history.

Born to a Huguenot family, the son of a Marshal of France, he was introduced to the art of war at a young age. He first served as a volunteer in the Dutch States Army under the orders of his maternal uncles Maurice of Nassau and Frederick Henry before pursuing his career in the service of France, where his noble origins and proven qualities soon saw him rise to the top of the military hierarchy. He rose to prominence during the Thirty Years' War by capturing the fortress of Breisach in 1638. Promoted Marshal of France in 1643, he struck against Bavaria the following year, defeating the Bavarian army in three years of campaigning and forcing the Elector of Bavaria to make peace. The Elector soon broke the treaty and in 1648 Turenne invaded again with Swedish support, subduing the Imperial army at Zusmarshausen and pacifying Bavaria.

Sir Constantijn Huygens, Lord of Zuilichem (/ˈhaɪɡənz/ HY-gənz, US also /ˈhɔɪɡənz/ HOY-gənz, Dutch: [ˈkɔnstɑntɛin ˈɦœyɣə(n)s]; 4 September 1596 – 28 March 1687), was a Dutch Golden Age poet and composer. He was also secretary to two Princes of Orange: Frederick Henry and William II, and the father of the scientist Christiaan Huygens.

Amalia of Solms-Braunfels (31 August 1602 – 8 September 1675) was Princess of Orange by marriage to Frederick Henry, Prince of Orange. She acted as the political adviser of her spouse during his reign, and acted as his de facto deputy and regent during his infirmity from 1640 to 1647. She also served as chair of the regency council during the minority of her grandson William III, Prince of Orange from 1650 until 1672.

The Dutch Waterline (Dutch: Hollandsche Waterlinie; modern spelling: Hollandse Waterlinie) was a series of water-based defences conceived by Maurice of Nassau in the early 17th century, and realised by his half brother Frederick Henry. Combined with natural bodies of water, the Waterline could be used to transform Holland, the westernmost region of the Netherlands and adjacent to the North Sea, almost into an island. In the 19th century, the Line was extended to include Utrecht.

On July 26, 2021, the line was added to the Defence Line of Amsterdam to become the Dutch Water Defence Lines UNESCO World Heritage Site.