Question: Where did Carl Von Fersen's wife die?

Knowledge 1: Carl von Fersen
Count Carl von Fersen (1716-1786), was a Swedish courtier.He was an amateur singer and a leading member of the amateur theater of king Gustav III of Sweden.He was also the director of the Royal Swedish Opera in 1780-86, and a member of the Royal Swedish Academy of Music (1772).He was the son of Hans Reinhold von Fersen and Eleonora Margareta Wachtmeister and the brother of Axel von Fersen the Elder, and thus the uncle of Axel von Fersen the Younger.He married Charlotta Sparre and became the father of five daughters, notably Augusta Löwenhielm and Ulla von Höpken.Carl von Fersen spent most of his life at the royal court, where he was an appreciated participator of social life. [SEP] Knowledge 2: Charlotta Sparre
Charlotta "Lotta" Fredrika Sparre (1719 – 20 December 1795, Stockholm), commonly named Lotta Sparre, was a Swedish noble and courtier.
Knowledge 1: Carl von Fersen
Count Carl von Fersen (1716-1786), was a Swedish courtier.He was an amateur singer and a leading member of the amateur theater of king Gustav III of Sweden.He was also the director of the Royal Swedish Opera in 1780-86, and a member of the Royal Swedish Academy of Music (1772).He was the son of Hans Reinhold von Fersen and Eleonora Margareta Wachtmeister and the brother of Axel von Fersen the Elder, and thus the uncle of Axel von Fersen the Younger.He married Charlotta Sparre and became the father of five daughters, notably Augusta Löwenhielm and Ulla von Höpken.Carl von Fersen spent most of his life at the royal court, where he was an appreciated participator of social life. [SEP] Knowledge 2: Louise von Fersen
Lovisa Sofia Louise" Sophie" von Fersen, née Piper (26 October 1777 – 4 January 1849), was a Swedish countess and courtier.Louise von Fersen was the daughter of court chamberlain Sten Abraham Piper and Catharina Ehrensvärd, who had been "hovfröken" (maid of honour) prior to her marriage.She served as maid of honour to princess Sophia Albertina of Sweden in 1794-97.She married the courtier count Fabian Reinhold von Fersen in 1797.By marriage, she became the sister-in-law to the famous Axel von Fersen the Younger as well as Sophie Piper, who was married to her brother Carl Piper.Their children: Axel von Fersen (1798–1839), Fabian von Fersen (1800-1800), Gustaf Hans von Fersen (1802-1839) and the great heiress Louise von Fersen (1816–1879), of whom all sons died officially childless (although Gustaf Hans had in fact several children with Carolina Brunström), were the last of the von Fersen family.She served as "hovmästarinna" (deputy mistress of the robes) in 1804-05 and "överhovmästarinna" (Mistress of the Robes) in 1805-09 to queen Frederica, and Mistress of the Robes to queen Charlotte in 1809-10.Count Hans Gabriel Trolle-Wachtmeister said of her that she "was the most beautiful Juno-like figure you could see  undoubtedly the most accomplished woman in high society".
Knowledge 1: Carl von Fersen
Count Carl von Fersen (1716-1786), was a Swedish courtier.He was an amateur singer and a leading member of the amateur theater of king Gustav III of Sweden.He was also the director of the Royal Swedish Opera in 1780-86, and a member of the Royal Swedish Academy of Music (1772).He was the son of Hans Reinhold von Fersen and Eleonora Margareta Wachtmeister and the brother of Axel von Fersen the Elder, and thus the uncle of Axel von Fersen the Younger.He married Charlotta Sparre and became the father of five daughters, notably Augusta Löwenhielm and Ulla von Höpken.Carl von Fersen spent most of his life at the royal court, where he was an appreciated participator of social life. [SEP] Knowledge 2: Hedda von Fersen
Hedvig" Hedda" Eleonora von Fersen( 2 July 1753 – 8 November 1792, Pisa) was a Swedish noble, lady in waiting to the Swedish queen, Sophia Magdalena of Denmark.She was the daughter of Axel von Fersen the Elder and Hedvig Catharina De la Gardie and the sister of Count Axel von Fersen the Younger, Sophie Piper and Fabian von Fersen( 1762 – 1818).In 1773, she married marshal Count Thure Leonard Klinckowström in his second marriage, and with him had four children, among them the artist Hedvig Amalia Charlotta Klinckowström and Axel Leonhard Klinckowström, member of the Royal Swedish Academy of War Sciences and la Société pour l'encouragement de l'industrie nationale.

Answer: Stockholm