Russian baritone (b. 1850; d. 1904), born Pavel Borisovich Borisov (Павел Борисович Борисов).
In 1876 Borisov graduated from the Saint Petersburg Conservatory, and gave recitals in Kharkov, Kiev, Odessa and other Russian cities, as well as in England and Italy. From 1882 he was an artist at the Bolshoi Theatre in Moscow, where he premiered the role of Kochubey in Tchaikovsky's Mazepa in 1884. After 1894 he moved to Odessa, where he taught singing classes.
Correspondence with Tchaikovsky
One letter from Tchaikovsky to Pavel Borisov has survived, dating from 1884, and has been translated into English on this website:
3 letters from Borisov to the composer, dating from 1885, are preserved in the Klin House-Museum Archive.