The city of Mannheim, founded in 1606, was fortified and at the present site of the castle there was a fortress called Friedrichsburg, sometimes serving as alternative residence for the Elector, one of the most important territorial princes of the Holy Roman Empire.
Karl Philip died in 1742 and was succeeded by a distant relative, the young Count Palatine of Sulzbach and later Duke of Bavaria Charles Theodor.
During Napoleon's reorganization of Germany, the Electorate of the Palatinate was split up and Mannheim became part of the Grand Duchy of Baden, thus losing its capital/residence status.
Some glamour returned to Mannheim Palace when Stéphanie de Beauharnais, the consort of Grand Duke Karl of Baden, resided here after 1806.
These plans came to nothing and in recent years the palace has been renovated extensively thanks to private donations and government funding totaling more than 54 million euro.
Initially constructed as defensive military fortification designed to protect up to 1,500 residents or valued materials from Russian and Allied bombing attacks, it served as a hotel with a capacity for up to 65 guests after the war.
Today it is used as occasional exposition space for modern and urban art, e.g. during the Long Night of Museums in Mannheim.
[3] The northern wing includes the impressive Schlosskirche (palace church) and the law section, as well as Mannheim's Amtsgericht (lower district court).
The palace has been repainted in a bright ochre/yellow, the Mittelbau (Corps de Logis) has been thoroughly rebuilt (including a new roof construction), and the Ehrenhof (Court of Honor) was restructured and paved with granite.