You can help expand this article with text translated from the corresponding article in German. (December 2016) Click [show] for important translation instructions. Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing German Wikipedia article at [[:de:Schloss Oranienstein]]; see its history for attribution. You may also add the template {{Translated|de|Schloss Oranienstein}} to the talk page. For more guidance, see Wikipedia:Translation.

Schloss Oranienstein is one of the palaces of the House of Orange-Nassau, sited at Diez on the Lahn. It was built on the ruins of Dierstein Abbey between 1672 and 1681 for Countess Albertine Agnes of Nassau after she was widowed.

After the French Republican invasion destroyed the Dutch Republic in 1795, stadtholder William V, Prince of Orange and his family first fled to England, before settling in Oranienstein for several years. Here, William and his son William Frederick issued the Oranienstein Letters, recognising the Batavian Republic and renouncing their stadtholderate and territorial claims in the Netherlands in return for financial and territorial compensation elsewhere, granted by First Consul Napoleon Bonaparte. In 1806, the castle fell to the newly formed Grand Duchy of Berg. Napoleon auctioned off the castle's entire contents in 1811. After Napoleon's defeat, the Congress of Vienna assigned Oranienstein to the Duchy of Nassau.

Following Nassau's defeat of the in the Austro-Prussian War, the Duchy was annexed by Prussia in 1866. One year later, the palace was turned over to the Royal Prussian Army, which established a cadet school in Oranienstein. After the First World War, the cadet school was dissolved. On the occasion of the 600th anniversary of the town of Diez in 1929, the castle was renovated and opened to the public. Under Nazi Germany, the castle was used as a boarding school of the National Political Education Institute from 1934 to 1945. After the end of the Second World War, the castle was turned over to the German Bundeswehr in 1957 and they still occupy it today, together with adjacent barracks. It also houses a museum.

• http://www.museumdiez.de/content/2_14_Das-Museum-Nassau-Oranien-Diez.php

50°23′02″N 8°00′40″E / 50.3839°N 8.0111°E / 50.3839; 8.0111

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