Nikolai or Nicolaus Ivanovich von Zaremba (1821-1879) was a Russian musical theorist, teacher and composer. His most famous student was Pyotr Ilyich Tchaikovsky, who became his pupil in 1861. Others included Dostojevsky’s nephews, the children of his brother Mikhail[1] and Vasily Safonov. Until 2010 almost nobody knew what he had composed. His works: two overtures, 1 string quartet, 9 piano works, many choir works, and an oratorio John the Baptist.
Source: Wikipedia