Question: When did Sila Zandukeli-Sandunov's wife die?

Knowledge 1: Sila Zandukeli-Sandunov
Sila Nikolaevich Sandunov , born Silovan Nikolozis dze Zandukeli , (born 1756— Died 1820) was a businessman and actor of Georgian origin active at the court of Catherine the Great.Sandunov's family emigrated from Georgia to Russia proper as part of an entourage accompanying the exiled Georgian monarch Vakhtang VI.Sandunov is best remembered today as the founder of the eponymous Sanduny Baths, an architectural and cultural landmark of downtown Moscow.The businessman started his investment in the baths by selling diamonds he had received as a wedding gift from Empress Catherine, who personally attended the wedding ceremony at the royal chapel.Sandunov was married to mezzo-soprano Elizabeth Sandunova. [SEP] Knowledge 2: Elizabeth Sandunova
Elizabeth S. Sandunova née Uranova (1772/76 – 3 December 1826), was a Russian Empire stage actress and operatic mezzo-soprano.Wife of Sila Sandunov.
Knowledge 1: Sila Zandukeli-Sandunov
Sila Nikolaevich Sandunov , born Silovan Nikolozis dze Zandukeli , (born 1756— Died 1820) was a businessman and actor of Georgian origin active at the court of Catherine the Great.Sandunov's family emigrated from Georgia to Russia proper as part of an entourage accompanying the exiled Georgian monarch Vakhtang VI.Sandunov is best remembered today as the founder of the eponymous Sanduny Baths, an architectural and cultural landmark of downtown Moscow.The businessman started his investment in the baths by selling diamonds he had received as a wedding gift from Empress Catherine, who personally attended the wedding ceremony at the royal chapel.Sandunov was married to mezzo-soprano Elizabeth Sandunova. [SEP] Knowledge 2: Etan Boritzer
Etan Boritzer( born 1950) is an American writer of children ’s literature who is best known for his book" What is God?" first published in 1989.His best selling" What is?" illustrated children's book series on character education and difficult subjects for children is a popular teaching guide for parents, teachers and child- life professionals.Boritzer gained national critical acclaim after" What is God?" was published in 1989 although the book has caused controversy from religious fundamentalists for its universalist views.The other current books in the" What is?" series includeWhat is Love?,What is Death?,What is Beautiful?,What is Funny?,What is Right?,What is Peace?,What is Money?,What is Dreaming?,What is a Friend?,What is True?,What is a Family?,What is a Feeling?"The series is now also translated into 15 languages.Boritzer was first published in 1963 at the age of 13 when he wrote an essay in his English class at Wade Junior High School in the Bronx, New York on the assassination of John F. Kennedy.His essay was included in a special anthology by New York City public school children compiled and published by the New York City Department of Education.Boritzer now lives in Venice, California and maintains his publishing office there also.He has helped numerous other authors to get published through" How to Get Your Book Published!" programs.Boritzer is also a yoga teacher who teaches regular classes locally and guest- teaches nationally.He is also recognized nationally as an erudite speaker on" The Teachings of the Buddha."
Knowledge 1: Sila Zandukeli-Sandunov
Sila Nikolaevich Sandunov , born Silovan Nikolozis dze Zandukeli , (born 1756— Died 1820) was a businessman and actor of Georgian origin active at the court of Catherine the Great.Sandunov's family emigrated from Georgia to Russia proper as part of an entourage accompanying the exiled Georgian monarch Vakhtang VI.Sandunov is best remembered today as the founder of the eponymous Sanduny Baths, an architectural and cultural landmark of downtown Moscow.The businessman started his investment in the baths by selling diamonds he had received as a wedding gift from Empress Catherine, who personally attended the wedding ceremony at the royal chapel.Sandunov was married to mezzo-soprano Elizabeth Sandunova. [SEP] Knowledge 2: Harry Wainwright (footballer)
Harry Wainwright( born 1899; date of death unknown) was an English footballer.

Answer: 3 December 1826