Grevs Ivan (1860–1941) – historian, one of the founders of the Russian school of medievalism.
After the Larin Gymnasium, in 1879, he entered the Historical and Philological Faculty of the St. Petersburg University; there he wrote his first research work ‘Roman Byzantine State in the Sixth Century on the Base of Canonic Books of Christian Emperors’.
He took part in groups of Narodniki, from 1886 till 1903, he was under a hidden police surveillance. In 1890-s, he made lectures at the St. Petersburg University, and at the Bestuzhev Female Courses (1892-1899 and 1902-1918). In 1900, he defended his Master thesis ‘Essays from the History of the Roman Landownership, Mainly in the Epoch of Empire’. In 1890-1892 and 1894-1896, he had training periods abroad. Since 1905, he was a member of the CD Party (Constitutional Democrats).