State councillor, Secretary of the Arts Committee at the Moscow Conservatory, and director of the Russian Musical Society (b. 9/21 June 1829 in Kozlov, near Tambov; d. 5/17 April 1890 in Moscow), born Nikolay Prokofievich Sitovsky (Николай Прокофьевич Ситовский).
Correspondence with Tchaikovsky
One letter from Tchaikovsky to Nikolay Sitovsky has survived, dating from 1889, and has been translated into English on this website:
7 letters from Sitovsky to the composer, dating from 1885 to 1889, are preserved in the Klin House-Museum Archive.