April 19 (May 1) 1863, in the family of a military physician, was born Mikhail Nestorovich Speransky, historian of literature and theater, Slaves specialist, Byzantinologist, ethnographer, archaeographer, folklorist, professor at Moscow University (1907-1923), corresponding member of the St. Petersburg Imperial Academy of Sciences (from 1902), member of the Academy of Sciences of the USSR (1921-1934).