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.
Rhineland-Palatinate
The constitutional bodies, the Government ("Landesregierung"), the Parliament ("Landtag") and the Constitutional Court ("Verfassungsgerichtshof"), established their provisional seat in Koblenz. In the following period, Koblenz and Mainz emphasized their suitability as the state capital in a public debate. From the very beginning, Minister-President Altmeier pressed for Mainz as the capital because he knew that the south of the country, especially the Palatinate, would not accept Koblenz, which was far to the north and formerly Prussian. On 16 May 1950, the "Landtag" decided to relocate itself and the "Landregierung" from Koblenz to Mainz. After the government and parliament moved to Mainz, many state authorities and courts remained in Koblenz, including the Constitutional Court and the State Archives. In addition, the German Federal Archives and Federal Office of Hydrology were established in Koblenz in 1952.