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.
[1] Cyril Toumanoff was born on 10 October 1913[2][3] 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)[4] whose ancestors had emigrated from their original homeland in Cilician Armenia in the 15th century.
On December 6, 1850, the Tumanishvili were officially enrolled on the Russian Empire's list of Georgian princely families as knyaz Tumanov.
[5] Toumanoff's mother, Yelizaveta Zhdanova, was a descendant of a number of Russian noble families, with genealogical ties with Western European nobility.