Question: In what year was the writer of the opera "Mazeppa" born?
Related documents: [0]  [DOC] Mazeppa, properly Mazepa (Russian: Мазепа ), is an opera in three acts (six scenes) by Pyotr Ilyich Tchaikovsky. The libretto was written by Victor Burenin and is based on Pushkin's poem "Poltava". [END] 
[1]  [DOC] 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. [END] 
Answer: 
1840
1840