After 1743
The Rheinbundakte, the treaty of July 12, 1806 that created the Confederation of the Rhine, mediatised Nassau-Siegen and placed it under the sovereignty of the newly created Grand Duchy of Berg. In 1808, Prince William VI of Orange-Nassau lost his remaining German possessions, as a punishment for his opposition to Napoleon. In 1813, after the Battle of Leipzig, he regained his territories. In a treaty signed on 31 May 1815, he ceded his German possessions to Prussia, in return for Prussia supporting the creation of the United Kingdom of the Netherlands, where he ruled as King William I.
Read more about this topic: House Of Nassau-Siegen