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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.
Circle of the Rhine
In 1837, the Circle of the Rhine was renamed the Palatinate ('). It was also referred to as the Rhenish Palatinate ('). The territory remained Bavarian until 30 Aug 1946, with the exception of the area detached in 1920, which roughly corresponded to the present day county of . It then became part of the newly formed federal state of Rhineland-Palatinate.