Question: When was the Russian librettist whose work was used in the opera Dubrovsky born?

full_context: Document 1: The Tsar's Bride (opera): The Tsar's Bride (Russian: Царская невеста , "Tsarskaya nevesta") is an opera in four acts by Nikolai Rimsky-Korsakov, the composer's tenth opera. The libretto, by Ilia Tyumenev, is based on the drama of the same name by Lev Mey. Mey's play was first suggested to the composer as an opera subject in 1868 by Mily Balakirev. (Alexander Borodin, too, once toyed with the idea.) However, the opera was not composed until thirty years later, in 1898. The first performance of the opera took place in 1899 at the Moscow theater of the Private Opera of S.I. Mamontov.
Document 2: Rusalka (Dargomyzhsky): Rusalka (Russian: Руса́лка ) is an opera in four acts, six tableaux, by Alexander Dargomyzhsky, composed during 1848-1855. The Russian libretto was adapted by the composer from Pushkin's incomplete dramatic poem of the same name. It premiered on 4 May 1856 (Old Style) at the Theatre-circus, conducted by Konstantin Lyadov (father of Anatoly Lyadov), choreographed by Marius Petipa and Nikolay Goltz, but was badly received predominantly by the aristocracy.
Document 3: Iolanta: Iolanta, Op. 69, (Russian: Иоланта ) is a lyric opera in one act by Pyotr Tchaikovsky. It was the last opera he composed. The libretto was written by the composer's brother Modest Tchaikovsky, and is based on the Danish play "Kong Renés Datter " ("King René's Daughter") by Henrik Hertz, a romanticised account of the life of Yolande de Bar. In the original Danish play, the spelling of the princess's name was "Iolanthe", later adopted for the otherwise unrelated Gilbert and Sullivan operetta of that name. The play was translated by Fyodor Miller and adapted by Vladimir Zotov. The opera received its premiere on 18 December 1892 in Saint Petersburg.
Document 4: Pyotr Ilyich Tchaikovsky: Pyotr Ilyich Tchaikovsky ( ; Russian: Пётр Ильи́ч Чайко́вский ; 25 April/7 May 1840 – 25 October/6 November 1893), often anglicized as Peter Ilich Tchaikovsky, was a Russian composer of the romantic period, some of whose works are among the most popular music in the classical repertoire. He was the first Russian composer whose music made a lasting impression internationally, bolstered by his appearances as a guest conductor in Europe and the United States. Tchaikovsky was honored in 1884, by Emperor Alexander III, and awarded a lifetime pension.
Document 5: Pyotr Ilyich Tchaikovsky and The Five: In mid- to late-19th-century Russia, Pyotr Ilyich Tchaikovsky and a group of composers known as The Five had differing opinions as to whether should be composed following Western or native practices. Tchaikovsky wanted to write professional compositions of such quality that they would stand up to Western scrutiny and thus transcend national barriers, yet remain distinctively Russian in melody, rhythm and other compositional characteristics. The Five, made up of composers Mily Balakirev, Alexander Borodin, César Cui, Modest Mussorgsky, and Nikolai Rimsky-Korsakov, sought to produce a specifically Russian kind of art music, rather than one that imitated older European music or relied on European-style conservatory training. While Tchaikovsky himself used folk songs in some of his works, for the most part he tried to follow Western practices of composition, especially in terms of tonality and tonal progression. Also, unlike Tchaikovsky, none of The Five were academically trained in composition; in fact, their leader, Balakirev, considered academicism a threat to musical imagination. Along with critic Vladimir Stasov, who supported The Five, Balakirev attacked relentlessly both the Saint Petersburg Conservatory, from which Tchaikovsky had graduated, and its founder Anton Rubinstein, orally and in print.
Document 6: Modest Ilyich Tchaikovsky: Modest Ilyich Tchaikovsky (Russian: Моде́ст Ильи́ч Чайко́вский ; 13 May [O.S. 1 May] 1850 –15 January [O.S. 2 January] 1916 ) was a Russian dramatist, opera librettist and translator.
Document 7: Ivan Turgenev: Ivan Sergeyevich Turgenev ( ; Russian: Ива́н Серге́евич Турге́нев ; ] ; November 9 [O.S. October 28] 1818 September 3, 1883) was a Russian novelist, short story writer, and playwright.
Document 8: Ruslan and Lyudmila (opera): Ruslan and Lyudmila (Russian: Руслан и Людмила , "Ruslan i Lyudmila") is an opera in five acts (eight tableaux) composed by Mikhail Glinka between 1837 and 1842. The opera is based on the 1820 poem of the same name by Alexander Pushkin. The Russian libretto was written by Valerian Shirkov, Nestor Kukolnik and N. A. Markevich, among others. Pushkin's death in the famous duel prevented him from writing the libretto himself as planned.
Document 9: Pyotr Ilyich Tchaikovsky: Pyotr Ilyich Tchaikovsky ( ; Russian: Пётр Ильи́ч Чайко́вский ; 25 April/7 May 1840 – 25 October/6 November 1893), often anglicized as Peter Ilich Tchaikovsky, was a Russian composer of the romantic period, some of whose works are among the most popular music in the classical repertoire. He was the first Russian composer whose music made a lasting impression internationally, bolstered by his appearances as a guest conductor in Europe and the United States. Tchaikovsky was honored in 1884, by Emperor Alexander III, and awarded a lifetime pension.
Document 10: Dubrovsky (opera): Dubrovsky (Russian: "Дубровский" ) is an opera in four acts (5 scenes) Op. 58, by Eduard Nápravník, to a Russian libretto by Modest Ilyich Tchaikovsky after the novel of the same title (1832) by Alexander Pushkin.
Document 11: Modest Mussorgsky: Modest Petrovich Mussorgsky (Russian: Моде́ст Петро́вич Му́соргский ; ] ; 21 March [O.S. 9 March] 1839 – 28 March [O.S. 16 March] 1881 ) was a Russian composer, one of the group known as "The Five". He was an innovator of Russian music in the romantic period. He strove to achieve a uniquely Russian musical identity, often in deliberate defiance of the established conventions of Western music.
Document 12: Nestor Kukolnik: Nestor Vasilievich Kukolnik (Russian: Нестор Васильевич Кукольник ) (1809–1868) was a Russian playwright and prose writer of Carpatho-Rusyn origin. Immensely popular during the early part of his career, his works were subsequently dismissed as sententious and sentimental. Today, he is best remembered for having contributed to the libretto of the first Russian opera, "A Life for the Tsar" by Mikhail Glinka. Glinka also set many of his lyrics to music.
Document 13: Eugene Onegin (opera): Eugene Onegin (Russian: Евгений Онегин , "Yevgény Onégin"), Op. 24, is an opera ("lyrical scenes") in 3 acts (7 scenes), composed by Pyotr Ilyich Tchaikovsky. The libretto, organised by the composer himself, very closely follows certain passages in Alexander Pushkin's novel in verse, retaining much of his poetry. Tchaikovsky's friend Konstantin Shilovsky contributed M. Triquet's verses in Act 2, Scene 1, while Tchaikovsky himself arranged the text for Lensky's arioso in Act 1, Scene 1, and almost all of Prince Gremin's aria in Act 3, Scene 1.
Document 14: Grigory Kugushev: Prince Grigory Vasilyevich Kugushev (Russian: Григорий Васильевич Кугушев , 17 March 1824, – 3 October 1871) was a Russian writer, poet and playwright whose comedies (including "Goluboi Kapot", Blue Hood; "Pari", The Bet; "Priyomysh", Foster) had great (if not very lasting) success in the Russian Imperial Theatres in 1850s. More substantial and critically acclaimed were Kugushev's works of fiction, notably "Kornet Otletayev" (Корнет Отлетаев, a three-part novella, first published by "Russky Vestnik" in 1856) and the four-part novel "Postoronneye Vliyaniye" (Постороннее влияние, 1858—1859). He also wrote the libretto for the epic drama opera "Mazeppa" (1859) by Baron
Document 15: The Jacobin: The Jacobin ("Jakobín" in Czech) is an opera in three acts by Antonín Dvořák to an original Czech libretto by Marie Červinková-Riegrová. Červinková-Riegrová took some of the story's characters from the story by Alois Jirásek, "At the Ducal Court", but devised her own plot about them. The first performance was at the National Theatre, Prague, 1889. Červinková-Riegrová revised the libretto, with Dvořák's permission, in 1894, notably in the last act. Dvořák himself revised the music in 1897 (the revised premiere was on 19 June 1898, under Adolf Čech).
ground_truth: 13 May [O.S. 1 May] 1850