text: Crown prince At age 16, Frederick formed an attachment to the king's 17-year-old page, Peter Karl Christoph von Keith. Wilhelmine recorded that the two "soon became inseparable.... He served my brother from feelings of real devotion". Wilhelmine would further record that "Though I had noticed that he was on more familiar terms with this page than was proper in his position, I did not know how intimate the friendship was." As Frederick was almost certainly homosexual, his relationship with Keith may have been homoerotic, although the extent of their intimacy remains ambiguous. When Frederick William heard rumours of their relationship, Keith was sent away to an unpopular regiment near the Dutch frontier.
  In the mid-1720s, Queen Sophia Dorothea attempted to arrange the marriage of Frederick and his sister Wilhelmine to her brother King George II's children Amelia and Frederick, the heir apparent. Fearing an alliance between Prussia and Great Britain, Field Marshal von Seckendorff, the Austrian ambassador in Berlin, bribed the Prussian Minister of War, Field Marshal von Grumbkow, and the Prussian ambassador in London, Benjamin Reichenbach. The pair undermined the relationship between the British and Prussian courts using bribery and slander. Eventually Frederick William became angered by the idea of Frederick being married to an English wife and under the influence of the British court. Instead, he signed a treaty with Austria, which vaguely promised to acknowledge Prussia's rights to the principalities of Jülich-Berg, which led to the collapse of the marriage proposal.