Treaty of Lunéville
In the Treaty of Lunéville in 1801, the Electorate of Mainz lost its worldly territory, including the Imperial fief of Kronberg, which was confiscated by the Prince of Nassau-Usingen in 1802, and formally awarded to him in 1803. In the Austro-Prussian War of 1866, the Duke of Nassau sided with Austria, thereby losing his land to Prussia.