Giuseppe Demachi (9 June 1732 – 1791) was a composer born in Alessandria, Italy.
 He served as a leading violinist in the city of his birth and later in the city of Geneva with the Concerto di Ginevra of the Societé de Musique.
 He also served in the employ of one Count Sannazzaro in the 1760s and 1770s at Casale Monferrato.
 Not much is known about his life or death.
 Other than the records of his birth in 1732, his next known appearance in history is in 1763 when he was listed as playing in Alessandria's orchestra.
 After 1777 he again falls into obscurity until his last verifiable appearance during some concerts in London in 1791.
 The date of his death is not known, but is believed to have been shortly after his performances in London.
The Count of Luxemburg is a 1972 German musical comedy film directed by Wolfgang Glück and starring Eberhard Wächter, Lilian Sukis and Erich Kunz.
 It is an adaptation of the operetta "Der Graf von Luxemburg" by Franz Lehár.
Ciprian Porumbescu (] ; born Ciprian Gołęmbiowski on October 14, 1853 – June 6, 1883) was a Romanian composer born in Șipotele Sucevei in Bukovina (now Shepit, Putyla Raion, Ukraine).
 He was among the most celebrated Romanian composers of his time; his popular works include "Crai nou", "Trei culori", "Song for the 1st of May", "Ballad for violin and piano", and "Serenada".
 In addition, he composed the music for "Pe-al nostru steag e scris Unire", which was used for Albania's national anthem, "Hymni i Flamurit".
 His work spreads over various forms and musical genres, but the majority of his work is choral and operetta.
Der Graf von Luxemburg ("The Count of Luxembourg") is an operetta in three acts by Franz Lehár to a German libretto by Alfred Willner, Robert Bodanzky, and Leo Stein.
 A Viennese take on bohemian life in Paris at the beginning of the 20th century, the story revolves around an impoverished aristocrat and a glamorous opera singer who have entered into a sham marriage without ever seeing each other and later fall in love at first sight, unaware that they are already husband and wife.
The Count of Luxembourg is an operetta in two acts with English lyrics and libretto by Basil Hood and Adrian Ross, music by Franz Lehár, based on Lehár's three-act German operetta "Der Graf von Luxemburg" which had premiered in Vienna in 1909.
 Lehár made amendments to his Viennese score to accommodate the two-act adaptation.
 He also interpolated into the score three new pieces: a waltz that he had written for a commemorative performance of "Der Graf" in Vienna; a song from his first operetta, "Wiener Frauen"; and a Russian dance from the opera "Tatjana".
Theobald I (French: "Thibaut or Thibauld de Bar") (born  1158 – died 13 February 1214) was the count of Bar from 1190 until his death, and a count of Luxemburg from 1197 until his death.
 He was the son of Reginald II of Bar and his wife Agnès de Champagne.
 He became count when his brother, Henry, was killed in the Siege of Acre.
Arkady Pogodin (Russian: Арка́дий Соломо́нович Пого́дин , born Arkady Piliver; 1901, Odessa, Russian Empire — 1975, Moscow, USSR) was a Soviet singer who worked in variety theater and operetta.
 At 16 years of age, Pogodin started appearing on theater stage in small roles.
 In 1922 he moved to Moscow, where he started working in small variety theaters performing funny songs.
 In 1924 he was already appearing on the stage of the prestigious Hermitage Theater.
 In 1938 Pogodin was invited to sing the lead role of Albert in an operetta titled "Delicate Diplomacy" ("Тонкая дипломатия" by Johann Strauss) at the Moscow Theater of Miniatures; he performed at the theater in the 1938–1939 season.
 Then he accidentally met theater director A. Arnold who invited him to sing the lead role in the operetta "Chocolate Soldier" (based on a work by Bernard Shaw, with music by the Pokrass brothers) that was set to open the 1939 summer season in the CDKA park.
 The operetta, which played in the park for a month, featured many famous artists including the Alexander Tsfasman Jazz Orchestra, Maria Mironova, etc.
 After that Tsfasman invited Pogodin to perform with his orchestra in the Khudozestvenny movie theater and on Saturdays and Sundays after midnight on the radio.
 Pogodin also recorded a number of grammophone records.
 And here composer and friend Konstantin Listov offered Pogodin to become the first artist to sing a new song he wrote.
 The song, titled "V Parke Chair" ("В парке Чаир"), instantly made "widely known in narrow circles" Pogodin a popular and trendy singer.
 In December 1939, he decided to take part in the first All-Russian Variety Artists Contest and became a Laureat along with such singers as Klavdiya Shulzhenko, Keto Dzhaparidze, etc.
 Since then he toured a lot and continued to sing on the radio.
 His grammophone records were very popular.
 Among his songs that were played everywhere were: "V Parke Chair", "Vozvrata Net" ("Возврата нет"), "Ya Zhdu Pisma" ("Я жду письма"), "Oglyanis" ("Оглянись").
 Football matches at the time would usually open with his song "Schastlivy Dozhdik" ("Счастливый дождик").
Franz Lehár (Hungarian: "Lehár Ferenc" ; 30 April 1870 – 24 October 1948) was an Austro-Hungarian composer.
 He is mainly known for his operettas, of which the most successful and best known is "The Merry Widow" ("Die lustige Witwe").
The Count of Luxemburg (German: Der Graf von Luxemburg) is a 1957 West German musical comedy film directed by Werner Jacobs and starring Gerhard Riedmann, Renate Holm and Gunther Philipp.
 It is based on the 1909 operetta "The Count of Luxemburg" by Franz Lehár.
Bonne of Luxemburg or "Jutta of Luxemburg" (20 May 131511 September 1349), was born Jutta (Judith), the second daughter of John the Blind, king of Bohemia, and his first wife, Elisabeth of Bohemia.
 She was the first wife of King John II of France; however, as she died a year prior to his accession, she was never a French queen.
 Jutta was referred to in French historiography as Bonne de Luxembourg.
 She was a member of the House of Luxembourg.
 Among her children were Charles V of France, Philip II, Duke of Burgundy, and Joan, Queen of Navarre.

Question: The film The Count of Luxemburg is based on an operetta by a composer born in what year?
Answer: 1870