Question: When did the opera in which Friederike Grün played Agathe premier ? 

full_context: Document 1: Oberon (Weber): Oberon, or The Elf King's Oath is a 3-act romantic opera in English with spoken dialogue and music by Carl Maria von Weber. The libretto by James Robinson Planche was based on a German poem, "Oberon", by Christoph Martin Wieland, which itself was based on the epic romance "Huon de Bordeaux", a French medieval tale.
Document 2: Johann Friedrich Kind: Johann Friedrich Kind (4 March 1768 Leipzig – 24 June 1843) was a German dramatist, most famous for writing the libretto for Carl Maria von Weber's opera "Der Freischütz" (1821).
Document 3: Anna Deinet: Anna Deinet (also Anna von Possart and Anna Deinet-Possart) (22 February 1843 - 18 August 1919) was a German operatic soprano who had an active career during the latter half of the 19th century. She had a lengthy career at the Bavarian State Opera where she particularly excelled in coloratura soprano roles. She is best remembered today for portraying Brangäne in the world premiere of Richard Wagner's "Tristan und Isolde" in 1865 and Helmwige in the premiere of Wagner's "Die Walküre" in 1869.
Document 4: Euryanthe: Euryanthe is a German "grand, heroic, romantic" opera by Carl Maria von Weber, first performed at the Theater am Kärntnertor, Vienna on 25 October 1823. Though acknowledged as one of Weber's most important operas, the work is rarely staged because of the weak libretto by Helmina von Chézy (who, incidentally, was also the author of the failed play "Rosamunde", for which Franz Schubert wrote music). "Euryanthe" is based on the 13th-century romance ""L'Histoire du très-noble et chevalereux prince Gérard, comte de Nevers et la très-virtueuse et très chaste princesse Euriant de Savoye, sa mye.""
Document 5: Der Wildschütz: Der Wildschütz oder Die Stimme der Natur ("The Poacher, or The Voice of Nature") is a German "Komische Oper", or comic opera, in three acts by Albert Lortzing from a libretto by the composer adapted from the comedy "Der Rehbock, oder Die schuldlosen Schuldbewussten" by August von Kotzebue. It had its premiere at the Stadttheater in Leipzig on 31 December 1842.
Document 6: Wilhelmine Ritter: Wilhelmine Ritter was a German operatic mezzo-soprano. Little is known about the artist and the details about her birth and training are unknown. She was a member of the Bavarian State Opera in Munich from 1866 through 1871. While there she notably created the roles of Flosshilde in Richard Wagner's "Das Rheingold" on 22 September 1869 and Grimgerde (one of the Valkyries) in Wagner's "Die Walküre" on 26 June 1869. Her last performance at the house was as Orfeo in Christoph Willibald Gluck's "Orfeo ed Euridice" in 1871. She got married soon after and retired permanently from the stage. Currently no further biographical details about Ritter have surfaced.
Document 7: Siegfried (opera): Siegfried, WWV 86C, is the third of the four music dramas that constitute "Der Ring des Nibelungen" ("The Ring of the Nibelung"), by Richard Wagner. It premiered at the Bayreuth Festspielhaus on 16 August 1876, as part of the first complete performance of "The Ring" cycle.
Document 8: 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 9: Der Freischütz: Der Freischütz , Op. 77, J. 277, (usually translated as "The Marksman" or "The Freeshooter") is a German opera with spoken dialogue in three acts by Carl Maria von Weber with a libretto by Friedrich Kind. It premiered on 18 June 1821 at the Schauspielhaus Berlin. It is considered the first important German Romantic opera, especially in its national identity and stark emotionality.
Document 10: Anna Kaufmann: Anna Kaufmann was a German operatic soprano who was a principal artist at the Bavarian State Opera in Munich from 1869 to 1872. Just prior to her appointment, the great soprano Mathilde Mallinger had left the Bavarian State Opera and Kaufmann succeeded her in the roles of Elsa in Richard Wagner's "Lohengrin", Elisabeth in Wagner's "Tannhäuser", and Eva in Wagner's "Die Meistersinger von Nürnberg" among other parts. She notably created the roles of Woglinde in Wagner's "Das Rheingold" on September 22, 1869 and Fricka in Wagner's "Die Walküre" on June 26, 1869. Currently, no further biographical details about Kaufmann's life both before and after her time at the Bavarian State Opera have surfaced.
Document 11: Karoline Seidler-Wranitzky: Karoline Seidler-Wranitzky (1790 - 7 December 1872) was a Czech operatic soprano. She notably created the role of Agathe in the world premiere of Carl Maria von Weber's "Der Freischütz" in 1821. She was the daughter of composer Anton Wranitzky and niece of composer Paul Wranitzky.
Document 12: 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.
Document 13: Carmen Reppel: Carmen Reppel is a German soprano active in both opera and concert. A member of the Staatstheater Hannover , she had a major international career, appearing in leading roles in over 60 operas. She also explored lesser-known repertoire such as Siegfried Wagner's "Schwarzschwanenreich " and appeared in contemporary operas, singing in world premieres of operas by Aribert Reimann and Flavio Testi. She is known for her parts in the "Jahrhundertring ", the centenary production of Wagner's "Der Ring des Nibelungen" at the Bayreuth Festival, including the filmed version of 1980.
Document 14: Lotte Lehmann: Charlotte "Lotte" Lehmann (February 27, 1888 – August 26, 1976) was a German soprano who was especially associated with German repertory. She gave memorable performances in the operas of Richard Strauss, Richard Wagner, Ludwig van Beethoven, Puccini, Mozart, and Massenet. The Marschallin in "Der Rosenkavalier", Sieglinde in "Die Walküre" and the title-role in "Fidelio" are considered her greatest roles. During her long career, Lehmann also made more than five hundred recordings. Her performances in the world of Lieder are considered among the best ever recorded.
Document 15: Friederike Grün: Friederike Grün (14 June 1836- January 1917) was a German operatic soprano who had an active career during the latter half of the 19th century. Possessing a powerful voice with a wide vocal range, she sang a broad repertoire that encompassed Italian, French, and German opera. High points from her stage repertoire included the title heroine in Vincenzo Bellini's "Norma", Agathe in Carl Maria von Weber's "Der Freischütz", Leonore in "Fidelio", Rachel in Fromental Halévy's "La Juive", and Valentine in Giacomo Meyerbeer's "Les Huguenots". She is best remembered today for portraying several roles in the first complete presentation of Richard Wagner's "The Ring Cycle" at the very first Bayreuth Festival in 1876.
ground_truth: 18 June 1821