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Pyotr Ilyich Tchaikovsky (7 May 1840–6 November 1893) was a Russian composer of the Romantic era. He wrote some of the most popular concert and theatrical music in the current classical repertoire, including the ballets Swan Lake and The Nutcracker, the 1812 Overture, his First Piano Concerto, several symphonies, and ten operas of which Eugene Onegin and The Queen of Spades are the most well-known. Although he enjoyed many popular successes, he was never emotionally secure, and his life was punctuated by personal crises and periods of depression. Contributory factors were his suppressed homosexuality and fear of exposure, his disastrous marriage, and the sudden collapse of the one enduring relationship of his adult life, his 13-year association with the wealthy widow Nadezhda von Meck.