Under the Treaty of the Confederation of the Rhine (German, Rheinbundakte), the Principality lost its independence in 1806 and went to the newly created Duchy of Nassau on the other side of the Lahn River. The Duchy had been carved out of the old Grand Duchy of Cleves and Berg (whose remaining lands went to Prussia in 1813) but it lasted for only 60 years before it was annexed in 1866 by Prussia. In the beginning, for several years, Prince Karl Ludwig Friedrich Alexander von Wied, demoted to a minor nobleman, was the administrator of the new District of Runkel for his superiors, the Dukes of Nassau.
