Karlsberg Castle is a castle ruin on Buchenberg east of Homburg in Saarland, Germany. The castle was constructed from 1778 to 1788 in Baroque and Classical style by Johann Christian von Mannlich, architect and general building director of the dukes of Zweibrücken, by order of Charles II August, Duke of Zweibrücken. The castle was the largest country palace of Europe and served as the residence of the Duke of Zweibrücken. In 1793 the castle was destroyed by French revolutionary troops.
Charles II August was the son of the Count Palatine and prince of Palatinate-Zweibrücken and Palatinate-Birkenfeld-Bischweiler Frederick Michael. This means, his father was the head of the house Palatinate-Birkenfeld-Bischweiler, a side branch of the house Palatinate-Zweibrücken-Birkenfeld, which was a side branch of the ducal house of Palatinate-Zweibrücken, which itself was a side branch of the house of Wittelsbach-Palatinate, which held the title of elector Palatinate of the Rhine and was the Protestant branch of the house of Wittelsbach.
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