In the next year he appointed his infant nephew, Prince Napoleon Louis Bonaparte (1804–1831), the elder son of Napoleon's brother Louis Bonaparte, King of Holland, Grand Duke of Berg; French bureaucrats under Pierre Louis Roederer administered the territory in his name.
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By the German Mediatisation, the Lordship of Weingarten was incorporated into the Kingdom of Württemberg and the Nassau core territories into the Grand Duchy of Berg and the Duchy of Nassau.