Queen of Sweden. She was a Hohenzollern Dynasty princess, the daughter of king Frederick William I of Prussia and Queen Sophia Dorothy, a princess of Brunswick-Lüneberg (Principality of Calenburg), and her brother was Frederick II the Great. Considered exceptionally beautiful, talented and intelligent, she was a prize catch when she married the future King Adolph Frederick of Sweden seven years before his ascension in 1751. She bore him five children. In contrast to him, she had a very forceful and ambitious personality and made herself a dominating role in Swedish politics. One of her pen pals was Voltaire and her literary interests and activities led to the foundation of Sweden's first Academy of Letters and a valuable library named for her. With Adolph Frederick finally king, the queen's dissatisfaction and frustration with government corruption and with the previous regime's constraints on royal power exploded into a campaign of activity and intrigue. The destabilizing party politics of the Hats failed their promises to strengthen the the king's position. The queen and a newly established Court Party started to plan a coup d'etat, and she was caught attempting to finance it by having the large exquisite diamonds in her Crown of the Queen replaced with cut glass. The plans were discovered in 1756 and some of the 'traitors' involved were executed, while the queen was officially censured but escaped the hatchet (having returned the diamonds). Adolph Frederick died in 1771 and she had trouble getting used to a secondary position as Dowager Queen, especially as concerned her daughter-in-law, the new Queen Sophia Magdalene of Sweden, whom she is alleged to have treated with cruelty. All around, Louise Ulrica has been considered a failure as a mother (and mother-in-law). Her relationship to her eldest, Gustav III, was permanently ruptured in 1778, as she was known to sarcastically entertain rumors about the paternity of his son, future King Gustav IV Adolph of Sweden, and she was only reconciled with him and met her young grandson on her death bed. The once so spirited and admired queen lived her final years comparatively lonely and died at Svartsjö Palace in Stockholm in 1782.