Frederick William succeeded his father as King of Prussia on 16 November 1797, beginning a reign that lasted until his death in 1840.

Frederick William, the son of Frederick William II of Prussia and Frederica Louisa of Hesse-Darmstadt, succeeded to the throne on 16 November 1797. He thereby became King of Prussia, a position he held until his death on 7 June 1840. Through his accession he also became, in personal union, the sovereign prince of the Principality of Neuchâtel. Despite his new royal status, he continued the civil family life he had led at the Kronprinzenpalais in Berlin, his problem-free marriage remaining unchanged even after he became king.

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