ession), however, the town and the castle lay under siege yet again, this time by 28,000 French troops. Despite attempts at storming the town, they could not penetrate its defences. In 1711, after a dispute over inheritance, Landgrave William of Hesse-Wanfried was awarded the Landgraviate of Hesse-Rheinfels; he then called himself William of Hesse-Rheinfels. The Emperor transferred the castle to him in 1718. In 1731, Christian of Hessen-Wanfried (known since 1711 as Hessen-Eschwege) inherited the Landgraviate of Hesse-Rheinfels along with the castle. The castle was ceded to Hesse-Kassel for good in 1735. In 1755, after Christian�s death, the Landgraviate passed to the Landgraviate of Hesse-Rotenburg. In 1794, the castle was given up to French Revolutionary troops without a fight, and in 1796 and 1797, great parts of it were blown up. French rule lasted until 1813.
In 1815, the castle passed into Prussian hands and Sankt Goar became a district seat. After the First World War, the town was for a while once again occupied by the French. The Second World War, too, came to Sankt Goar. In mid March 1945, American troops reached the town and occupied it, although occupational authority was transferred, once again, to the French in early July. Since 1946, Sankt Goar has been part of the then newly founded state of Rhineland-Palatinate. In the course of administrative restructuring in Rhineland-Palatinate, the district of Sankt Goar, whose seat the town had been, was dissolved in 1969 and the town was grouped into the Rhein-Hunsr�ck-Kreis, whose seat was in Simmern. In 1972, the town also became part of the Verbandsgemeinde of Sankt Goar-Oberwesel.
In the course of administrative restructuring, the new Verbandsgemeinde of Sankt Goar-Oberwesel was formed on 22 April 1972 out of the towns of Sankt Goar and Oberwesel, with its seat in the latter town.
On 7 June 1969, the formerly self-administering municipalities of Biebernheim and Werlau were amalgamated
