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Rhineland-Palatinate is one of the 16 Bundesländer (federal states) of Germany. It has an area of 19,846 km² and about 4.048 million inhabitants. The capital is Mainz. The federal state of Rhineland-Palatinate was established on 30 August 1946.
Gollenberg, Rhineland-Palatinate
In 1815, the Congress of Vienna assigned the "Birkenfelder Land" to the Grand Duke of Oldenburg, who took charge of his new holding on 16 April 1817, naming it the Principality of Birkenfeld. On 1 April 1937, under the Greater Hamburg Act, the old principality was absorbed into Prussia, which was still a distinct entity during the Third Reich. Since 1946, it has been part of the then newly founded state of Rhineland-Palatinate.