Frederick William II (Friedrich Wilhelm II.; 25 September 1744 – 16 November 1797) was King of Prussia from 1786 until his death in 1797. He was in personal union the Prince-elector of Brandenburg and (via the Orange-Nassau inheritance of his grandfather) sovereign prince of the Canton of Neuchâtel. Pleasure-loving and indolent, he is seen as the antithesis to his predecessor, Frederick the Great. Under his reign, Prussia was weakened internally and externally, and he failed to deal adequately with the challenges to the existing order posed by the French Revolution. His religious policies were directed against the Enlightenment and aimed at restoring a traditional Protestantism. However, he was a patron of the arts and responsible for the construction of some notable buildings, among them the Brandenburg Gate in Berlin. Frederick William was born in Berlin, the son of Prince Augustus William of Prussia (the second son of King Frederick William I of Prussia) and Duchess Luise of Brunswick-Wolfenbüttel. His mother's elder sister, Elisabeth, was the wife of Augustus William's brother King Frederick II ("Frederick the Great"). Frederick William became heir-presumptive to the throne of Prussia on his father's death in 1758, since Frederick II had no children. The boy was of an easy-going and pleasure-loving disposition, averse to sustained effort of any kind, and sensual by nature. His marriage with Elisabeth Christine of Brunswick-Wolfenbüttel, Crown Princess of Prussia, daughter of Charles I, Duke of Brunswick-Lüneburg, contracted 14 July 1765 in Charlottenburg, was dissolved in 1769. He then married Frederica Louisa of Hesse-Darmstadt, daughter of Ludwig IX, Landgrave of Hesse-Darmstadt on 14 July 1769 also in Charlottenburg. Although he had seven children by his second wife, he had an ongoing relationship with his mistress, Wilhelmine Enke (created Countess Wilhelmine von Lichtenau in 1796), a woman of strong intellect and much ambition, and had five children by her—the first when she was still in her teens.