Russian baritone (b. 13/25 March 1853 in Bolshoy Buyalik [now Blagoyevo], near Ivanovka; d. 31 May/13 June 1914 in Sofia), born Konstantin Ivanovich Stoyan (Константин Иванович Стоян); also known as Konstantin Ivanovich Mikhaylov (Константин Иванович Михайлов) or Konstantin Ivanovich Svetlov-Stoyan (Константин Иванович Светлов-Стоян).
He was an opera artist at the Bolshoi Theatre in Moscow, and corresponded with Tchaikovsky in 1893.
Correspondence with Tchaikovsky
One letter from Tchaikovsky to Konstantin Mikhaylov-Stoyan has survived, dating from 1893, which has been translated into English on this website:
One letter from Mikhaylov-Stoyan to the composer, dating from 1893, is preserved in the Klin House-Museum Archive.