The famous work of the great Russian historian Sergei Mikhailovich Solovyov (1820-1879) is the largest achievement of Russian historical science of the 19th century. Soloviev is the "first among equals" in the galaxy of brilliant Russian historians, which includes N. Karamzin, V. Klyuchevsky, N. Kostomarov, A. Presnyakov, T. Granovsky, S. Platonov and many others.