Question: Wilhelm von Lenz, was a Baltic German Russian official and writer, and was a friend of many mid-century Romantic composers, including Hector Berlioz, that died on which date, was a French Romantic composer, best known for his compositions "Symphonie fantastique" and "Grande messe des morts" (Requiem)?

full_context: Document 1: Wilhelm von Lenz: Wilhelm von Lenz (born 20 May 1809 in Riga - died 7 January 1883 in Saint Petersburg) was a Baltic German Russian official and writer. Wilhelm von Lenz was a friend of many mid-century Romantic composers, including Franz Liszt, Frédéric Chopin and Hector Berlioz, Lenz's most important and influential work was an early biography of the German composer Ludwig van Beethoven, entitled "Beethoven et ses trois styles" (1855), written in response to the disparagement of Beethoven by Alexander Ulybyshev in his "Nouvelle biographie de Mozart" (1843). Lenz promoted the idea (already suggested by earlier figures such as François-Joseph Fétis) that Beethoven's musical style be divided into three characteristic periods. Lenz's periodisation, with minor changes, is still widely used today by musicologists in discussing Beethoven's compositions.
Document 2: Hector Berlioz: Louis-Hector Berlioz (] (English: ); 11 December 1803 – 8 March 1869) was a French Romantic composer, best known for his compositions "Symphonie fantastique" and "Grande messe des morts" (Requiem). Berlioz made significant contributions to the modern orchestra with his "Treatise on Instrumentation". He specified huge orchestral forces for some of his works, and conducted several concerts with more than 1,000 musicians. He also composed around 50 songs. His influence was critical for the further development of Romanticism, especially in composers like Richard Wagner, Nikolai Rimsky-Korsakov, Franz Liszt, Richard Strauss, and Gustav Mahler.
Document 3: Ludwig van Beethoven (1712–1773): Ludwig van Beethoven the Elder, also Ludovicus van Beethoven and Lodewijk van Beethoven (January 5, 1712 – December 24, 1773) was a professional singer and music director, best known as the grandfather of the composer Ludwig van Beethoven.
Document 4: Ludwig van Beethoven: Ludwig van Beethoven ( , ; ] ; baptised 17 December 177026 March 1827) was a German composer and pianist. A crucial figure in the transition between the Classical and Romantic eras in Western art music, he remains one of the most famous and influential of all composers. His best-known compositions include 9 symphonies, 5 piano concertos, 1 violin concerto, 32 piano sonatas, 16 string quartets, his great Mass the "Missa solemnis", and one opera, "Fidelio".
Document 5: Richard Wagner: Wilhelm Richard Wagner ( ; ] ; 22 May 181313 February 1883) was a German composer, theatre director, polemicist, and conductor who is primarily known for his operas (or, as some of his later works were later known, "music dramas"). Unlike most opera composers, Wagner wrote both the libretto and the music for each of his stage works. Initially establishing his reputation as a composer of works in the romantic vein of Weber and Meyerbeer, Wagner revolutionised opera through his concept of the "Gesamtkunstwerk" ("total work of art"), by which he sought to synthesise the poetic, visual, musical and dramatic arts, with music subsidiary to drama. He described this vision in a series of essays published between 1849 and 1852. Wagner realised these ideas most fully in the first half of the four-opera cycle "Der Ring des Nibelungen" ("The Ring of the Nibelung").
Document 6: Beethoven and his contemporaries: During the course of his lifetime (1770–1827), Ludwig van Beethoven enjoyed relationships with many of his musical contemporaries. Beethoven was famously difficult to get along with, and the history of his relationships with contemporaries is littered with arguments, misunderstandings, and reconciliations. Beethoven had well-known fallings out with his one-time teacher, Joseph Haydn, with the piano virtuoso and composer Johann Nepomuk Hummel, and the German composer Carl Maria von Weber.
Document 7: Prix de Rome cantatas (Berlioz): The French composer Hector Berlioz made four attempts at winning the Prix de Rome music prize, finally succeeding in 1830. As part of the competition, he had to write a cantata to a text set by the examiners. Berlioz's efforts to win the prize are described at length in his "Memoirs". He regarded it as the first stage in his struggle against the musical conservatism represented by the judges, who included established composers such as Luigi Cherubini, François-Adrien Boieldieu and Henri Montan Berton. Berlioz's stay in Italy as a result of winning the prize also had a great influence on later works such as "Benvenuto Cellini" and "Harold en Italie". The composer subsequently destroyed the scores of two cantatas ("Orphée" and "Sardanapale") almost completely and reused music from all four of them in later works. There was a revival of interest in the cantatas in the late 20th century, particularly "La mort de Cléopâtre", which has become a favourite showcase for the soprano and mezzo-soprano voice.
Document 8: Symphonie fantastique: Symphonie fantastique: Épisode de la vie d'un artiste ... en cinq parties ("Fantastical Symphony: An Episode in the Life of an Artist, in Five Parts") Op. 14, is a program symphony written by the French composer Hector Berlioz in 1830. It is an important piece of the early Romantic period. The first performance was at the Paris Conservatoire in December 1830. Franz Liszt made a piano transcription of the symphony in 1833 (S. 470).
Document 9: Ludwig Wenzel Lachnith: Ludwig Wenzel Lachnith (Prague, July 7, 1746 – Paris, October 3, 1820) was a Bohemian horn player and versatile composer influenced by Joseph Haydn and Ignaz Pleyel. Today he is chiefly remembered because of his adaptions of operas by Wolfgang Amadeus Mozart. The French composer and writer Hector Berlioz immortalized him in a diatribe in his autobiography.
Document 10: Johann Georg von Browne: Count Johann Georg von Browne (or Johann Georg von Browne-Camus; 20 September 1767 – January 1827) was an officer in the Russian army, and settled in Vienna where he was a patron of Ludwig van Beethoven during the composer's early career.
Document 11: La Symphonie fantastique: La Symphonie fantastique is a 1942 French drama film by Christian-Jaque and produced by the German-controlled French film production company Continental Films. The film is based upon the life of the French composer Hector Berlioz. The title is taken from the five-movement programmatic "Symphonie fantastique" of 1830. The film lasts around 90 minutes and was first shown at the 'Normandie' cinema in Paris on 1 April 1942. The posters at the premiere contained the sub-title 'La Vie passionnée et glorieuse d'un génie' (which links with the quote from Hugo at the very end of the film).
Document 12: Requiem (Berlioz): The Grande Messe des morts (or Requiem), Op. 5, by Hector Berlioz was composed in 1837. The "Grande Messe des Morts" is one of Berlioz's best-known works, with a tremendous orchestration of woodwind and brass instruments, including four antiphonal offstage brass ensembles placed at the corners of the concert stage. The work derives its text from the traditional Latin Requiem Mass. It has a duration of approximately ninety minutes, although there are faster recordings of under seventy-five minutes.
Document 13: Ludwig van Beethoven: Ludwig van Beethoven ( , ; ] ; baptised 17 December 177026 March 1827) was a German composer and pianist. A crucial figure in the transition between the Classical and Romantic eras in Western art music, he remains one of the most famous and influential of all composers. His best-known compositions include 9 symphonies, 5 piano concertos, 1 violin concerto, 32 piano sonatas, 16 string quartets, his great Mass the "Missa solemnis", and one opera, "Fidelio".
Document 14: Te Deum (Berlioz): The Te Deum (Op. 22 / H.118) by Hector Berlioz (1803–1869) was completed in 1849. Like the earlier and more famous ""Grande Messe des Morts"", it is one of the works referred to by Berlioz in his Memoirs as "the enormous compositions which some critics have called architectural or monumental music." While the orchestral forces required for the "Te Deum" are not as titanic as those of the "Requiem", the work calls for an organ that can compete on equal terms with the rest of the orchestra. It lasts approximately fifty minutes and derives its text from the traditional Latin Te Deum, although Berlioz changed the word order for dramatic purposes.
Document 15: Carl Maria von Weber: Carl Maria Friedrich Ernst von Weber (18 or 19 November 1786 5 June 1826) was a German composer, conductor, pianist, guitarist and critic, and was one of the first significant composers of the Romantic school.
ground_truth: 8 March 1869