Nikolai Rubinstein
Prince Nikolai Petrovitch Troubetzkoy (1828–1900) was a Privy Counsellor and Chamberlain of the Russian Imperial Court. A relative of the Decembrist Prince Sergei Petrovich Troubetzkoy, he served as the President of the Moscow branch of the Russian Musical Society. For many years, he was a close aide of the composer Nikolai Rubinstein.