Sexuality[edit]
Many historians have considered whether Frederick the Great was homosexual or bisexual (and perhaps possibly celibate), and his relationship with Hans Hermann von Katte was widely speculated in the Prussian court to be romantic.[13] After Katte's execution by Frederick's father, Frederick was forced to marry Elisabeth Christine of Brunswick-Bevern, with whom he had no children. He immediately separated from his wife when Frederick William I died in 1740. In later years, Frederick would pay his wife formal visits only once a year.[142]
Frederick spent much of his time at Sanssouci, his favourite residence in Potsdam. The grounds there included a Friendship Temple (built as a memorial to his favourite sister, Wilhelmine), and celebrating the homoerotic attachments of Greek Antiquity, decorated with portraits of Orestes and Pylades, among others.[143] At Sanssouci Frederick entertained his most privileged guests, especially the French philosopher Voltaire, whom he asked in 1750 to come to live with him. The correspondence between Frederick and Voltaire, which spanned almost 50 years, was marked by mutual intellectual fascination. In person, however, their friendship was often contentious, as Voltaire abhorred Frederick's militarism. Voltaire's angry attack on Maupertuis, the President of Frederick's academy, provoked Frederick to burn the pamphlet publicly and put Voltaire under house arrest. Voltaire was accused by some of anonymously publishing The Private Life of the King of Prussia, wittily claiming Frederick's homosexuality and parade of male lovers, after he had left Prussia. Frederick neither admitted nor denied the contents of the book, nor ever accused Voltaire of having written it. Some years later, Voltaire and Frederick resumed their correspondence and eventually aired their mutual recriminations, to end as friends once more.[144]
Other historians disagree on the nature of Frederick's sexuality, saying that Frederick's writings indicate that he simply had greater priorities than women. In 2011, an unpublished erotic poem by Frederick was discovered amongst his letters; it was written, according to correspondence with Voltaire, in response to an Italian friend's contention that northern Europeans were not as passionate as southern Europeans.[145] Frederick's physician, Johann Georg Ritter von Zimmermann, claimed that the king let rumors of homosexuality appear to be true in order to avoid the public knowing that his genitalia were harmed by "a cruel surgical operation" to save his life from an unnamed venereal disease.[146] Historian Christopher Clark concludes Frederick "may well have abstained from sexual acts with anyone of either sex after his accession to the throne, and possibly even before. But if he did not do it, he certainly talked about it; the conversation of the inner court circle around him was peppered with homoerotic banter."[147]