Several dynastic marriages were considered for her from 1732 onward, including Frederick Lewis, Prince of Wales, Charles III of Spain and Louis of Hesse-Darmstadt,[1][page needed] but none came to fruition.

When negotiations were made to arrange a marriage for the newly elected crown prince Adolf Frederick of Sweden, the first candidate for the match was Princess Louise of Denmark.

[1][page needed] In accordance with this agreement, Louisa Ulrika or her sister Princess Anna Amalia of Prussia were to be selected for the Swedish match.

[1][page needed] It has been suggested that Fredrick's judgment was given because he believed that Anna Amalia would be easier to control as a Prussian agent in Sweden than the strong willed and dominant Louisa Ulrika.

On 17 July 1744, Louisa Ulrika and Adolf Frederick were married per procura in Berlin, with her favorite brother August Wilhelm as proxy for the absent groom.

On 18 August 1744, they were welcomed by King Frederick I at Drottningholm Palace, where their second wedding ceremony was performed the same day, followed by a ball, a court reception and the consummation of the marriage.

[1][page needed] Already during their first day together, she informed him that her brother Frederick the Great had plans for the alliance between Sweden, Russia and Prussia, and asked him to raise the subject with the Prussian envoy, which he also agreed to.

At the birth of her first child in 1745, no children had been born in the Swedish royal house in over 50 years and she gained initial popularity with her beauty, wit and interest in science and culture.

Upon her arrival, she was granted Drottningholm Palace as her summer residence, where the "Young Court", as it was called, amused themselves with picnics, masquerades and French language amateur theater.

When she, at one point, thought herself exposed to a plot, she wrote: "The laws are so strange, and one does not dare to arrest someone on mere suspicion without proof, which benefit the individual more than the Kingdom.

At Christmas 1744, she visited Tessin and gave him a lantern in the guise of the goddess Diana with the inscription: "Made only to shed light on the political system of the day".

[1][page needed] After the birth of her eldest son in 1746, she accompanied the Crown Prince on an official tour through the country, during which she gathered agents among members of the Caps through bribes.

[1][page needed] Her plans were opposed by Russia and Great Britain, who in 1746, allied with the Caps (party), attempted to stage a coup through their agents in Sweden against the royal house.

[1][page needed] In February 1748, Louisa Ulrika prepared her first coup d'état to deposed parliamentary rule in favor of absolute monarchy.

With the support of Tessin and Frederick the Great, Louisa Ulrika and the Hats party agreed to change the constitution in favor of more royal power, should the king die when the Russians were engaged in the war and unable to react.

[1][page needed] To investigate the preparations of the royal council, Louisa Ulrika personally contacted her favorite, Councillor Carl Gustaf Tessin, in his bed chamber that night.

On 26 March 1751, Adolf Frederick made an oath to the Riksdag of the Estates to respect the constitution before being acknowledged as king, in the presence of Louisa Ulrika.

In 1753, she founded the Royal Swedish Academy of Letters, History and Antiquities, and acted as patron of Carl von Linné, who was given the responsibility for the nature scientific collection at Drottningholm Palace.

She also acted as patron for artists such as Hedvig Charlotta Nordenflycht, Olof von Dalin, Jean Erik Rehn and Johan Pasch.

[1][page needed] Queen Louisa Ulrika strongly dominated her husband and the court, and she would likely had been the real ruler during her spouse's reign had Sweden been an absolute monarchy: at this point, however, the King was a mere decoration.

[1][page needed] According to Crown Prince Gustav wrote in 1769, that Tessin had made Louisa Ulrika "suggestions far from the reverence one is expected to show toward a sovereign.

In the three months following her coronation, Louisa Ulrika removed 44 diamonds from the Queen's Crown and replaced them with glass, which she pawned in Berlin as security for a loan by the help of her brother August.

A lady-in-waiting of the Queen, Ulrika Strömfelt, who was a loyal follower of the Hats and not a supporter of absolute monarchy, reportedly informed the Riksdag that parts of the Crown Jewels were missing.

To prevent this, she and her followers within the Hovpartiet, Hård, Horn and Brahe, planned to stage the coup before that day, despite the protests of king Adolf Frederick.

[1][page needed] On 4 August 1756, a delegation from the Riksdag, led by the Archbishop of Uppsala Samuel Troilius, presented Louisa Ulrika with an note, which she was made to reply with a letter of regret.

The Queen opposed the act and regarded is as an insult, especially since she assumed that a Swedish victory over Prussia would result in the deposition of Adolf Frederick in favor of Christian of Zweibrucken-Birkenfeld.

[1][page needed] In January 1762, her suggestion of peace with Prussia was accepted in the Riksdag through her bought parliamentarians there, in exchange for a promise not to take revenge on the Hats (party).

[1][page needed] As a sign of gratitude for this act, the government paid her debts, which made it possible for her to use her money to affect the voting in the Riksdag through bribes.

During the two years prior, Louisa Ulrika negotiated with members of both the Caps and the Hats to prepare for a successful reform in favor of absolute monarchy.

The powerful position of Queen Louisa Ulrika deteriorated with the declining health of her spouse, King Adolf Frederick, and the growing maturity of her son, Crown Prince Gustav.