Cyril Leo Toumanoff (Georgian: კირილ თუმანოვი; Russian: Кирилл Львович Туманов; 10 October 1913 – 4 February 1997) was a Georgian-American historian, and academic genealogist who mostly specialized in the history and genealogies of medieval Georgia, Armenia, Iran, and the Byzantine Empire. Born in the Russian Empire into a princely family, Toumanoff escaped to the United States after the Russian Revolution. His works have significantly influenced the Western scholarship of the medieval Caucasus.[1]