Cyril Toumanoff

Cyril Leo Toumanoff (; ; 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.

Family Cyril Toumanoff was born on 10 October 1913 in Saint Petersburg, the son of Prince Leo Tumanov, a military officer of the Russian Imperial army. His father, who was born in Yerevan, was descended from the Armeno-Georgian princely family of Tumanishvili (Russified to Tumanov) whose ancestors had emigrated from their original homeland in Cilician Armenia in the 15th century. Toumanoff's mother, Yelizaveta Zhdanova, was a descendant of a number of Russian noble families, with genealogical ties with Western European nobility. and the Grand Prior of Bohemia.