Filipp Fortunatov

Filipp Fyodorovich Fortunatov (Russian: Фили́пп Фёдорович Фортуна́тов; 14 January [O.S. 2 January] 1848 – 3 October [O.S. 20 September] 1914) was a Russian philologist, Indo-Europeanist and Slavist, best known for establishing the Fortunatov–de Saussure law.