Rhineland-Palatinate
On 10 July 1945 the occupation authority on the soil of the present-day Rhineland-Palatinate transferred from the Americans to the French. To begin with, the French divided the region provisionally into two "upper presidiums" ("Oberpräsidien"), Rhineland-Hesse-Nassau (for the hitherto Prussian government districts and regions of Koblenz, Trier, and Montabaur) and Hesse-Palatinate (for the hitherto Bavarian Palatinate and old Hessian-Darmstadt province of Rhenish Hesse). The formation of the state was ordained on 30 August 1946, the last state in the Western Zone of Occupation to be established, by Regulation No. 57 of the French military government under General Marie-Pierre Kœnig. It was initially called Rhenish-Palatinate ("Rheinpfälzisches Land" or "Land Rheinpfalz"); the name Rhineland-Palatinate ("Rheinland-Pfalz") was first confirmed in the constitution of 18 May 1947.
Nannhausen
In 1399, Nannhausen had its first documentary mention in a document from Count Johann IV of Sponheim. Nannhausen belonged to the Ravengiersburg Monastery and in 1557, in the wake of the Reformation, passed to the Duchy of Palatinate-Simmern. At first, the village was Lutheran, but then later it became Reformed. Once the Dukes of Palatinate-Simmern had died out in 1673, the village passed to Electoral Palatinate, and in 1686, it was no longer forbidden to practise the Catholic faith. Beginning in 1794, Nannhausen lay under French rule. In 1814 it was assigned to the Kingdom of Prussia at the Congress of Vienna. After being under French occupation again after each of the world wars, it became part of the then newly founded state of Rhineland-Palatinate in 1946. The current municipality came into being on 17 March 1974 through the merger of the municipalities of Nannhausen and Nickweiler.