However, although the castle was no longer the administrative centre of the Palatinate, important gatherings of the nobility continued to take place there into the 15th century, including the election of Ludwig IV as King of Germany in May 1314 and the wedding of Emperor Charles IV and Anna, only daughter of Rudolf II, Count Palatine, on 4 March 1349.
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The palas (residential building) is 2 storeys high, built of crushed stone lined with Rhenish Schwemmstein (a traditional artificial material made of dried pumice and lime, similar to concrete), and stands at the eastern, Rhine valley end of the courtyard, over a vaulted cellar that Ernst Stahl dated to the time of Conrad of Hohenstaufen.
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Most toll castles also had additional administrative and other functions, as border watch posts or residences, such as for example Stahleck Castle above Bacharach on the Rhine.