Nikolai or Nicolaus Ivanovich von Zaremba (Russian: Никола́й Ива́нович Заре́мба; 15 June [O.S. 3 June] 1821 – 8 April [O.S. 27 March] 1879) was a Russian musical theorist, teacher and composer. His most famous student was Pyotr Ilyich Tchaikovsky, who became his pupil in 1861. Others included Fyodor Dostoevsky's nephews, the children of his brother Mikhail and Vasily Safonov. Until 2010 almost nobody knew what he had composed. Source: Wikipedia (en)