Karsavin Lev (1882–1952) – historian, medievalist, historian of religious thought, philosopher.
In 1906, he graduated from the St. Petersburg University, where his supervisor was I. M. Grevs. He made lectures at the Historical and Philological Institute, at the High Female Courses, and since 1912, also at the St. Petersburg University. Master thesis: ‘Essays of Religious Life in Italy in the Twelfth – Thirteenth Centuries’ (1913); Doctor thesis: ‘Basics of the Medieval Religious Mentality in the Twelfth – Thirteenth Centuries, Particularly in Italy’ (1916). In 1921, he was elected as Professor of the Social-Pedagogical and legal Departments of the Faculty of Social Studies of the Petrograd University.