Princess Wilhelmina of Hesse-Kassel (25 February 1726 – 8 October 1808) was a Prussian princess, married to Prince Henry of Prussia. Wilhelmina was the daughter of Prince Maximilian of Hesse-Kassel and Friederike Charlotte of Hesse-Darmstadt, and the niece of William VIII, Landgrave of Hesse-Kassel and King Frederick I of Sweden. She was introduced to Henry when he visited Kassel in 1751 and was married to him on 25 June 1752 at Charlottenburg Palace. Henry's eldest brother, King Frederick the Great, insisted that his brother marry, of course equally, just as their father had once arranged Frederick's marriage against his will. He only left him the choice of which of the sisters from the House of Hesse he wanted. Wilhelmina was described as a charming beauty. Wilhelmina and Henry had their own court and lived at Schloss Rheinsberg and Berlin. Wilhelmina had no children with Henry, who was reported to pay more attention to his male friends than to her. At his marriage Henry described the situation to his siblings that he was "changing from the captivity of the king to the captivity of marriage". Although the whole court spied on her behavior, she always managed to appear in a good mood and not to offer court gossip a target thanks to her consistently friendly demeanor. The couple separated in 1766 after an alleged affair on Wilhelmina's side. After the separation, she lived at Prince Henry's Palais in Berlin, on the grand boulevard Unter den Linden, which the king had built for his brother between 1748 and 1753 (today the main building of the Humboldt University of Berlin). She occupied one half of the building while her husband lived in the other. She was popular with her husband's family, especially his brothers, while her husband was more distant towards her. Nevertheless, the Duke of Nevers wrote about Henry: "He shows more consideration for his wife than his brother." (What was meant was the behavior of the king to his wife Queen Elisabeth Christine.) The Swedish princess Hedvig Elisabeth Charlotte of Holstein-Gottorp described her at the time of her visit in 1798: She was a tall and handsome lady with a well kept figure, though very thin, and you can still see how remarkably beautiful she was in her youth. Her eyes are big and lively though somewhat protruding, and with a restless look. She is witty and literal, but as a