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Toumanov, Georgianized Toumanishvili or Toumaniani, armenianized Tumanyan or russianized Toumanov or Toumanoff (Georgian თუმანიშვილი, Armenian: Թումանյան, Թումանով, Russian Туманишви́ли,Тума́нов) is an ancient Armenian-Georgian princely family. The family has its roots in the ancient Armenian noble dynasty of the Mamikonians (Mamikonids). Through the branch of Toumanoffs (Georgian: Toumaniani) belonged to the Armenian Church, the Toumanishvili branch was of Greek Orthodox line.
The two Mamikonid princely Houses of Georgia (and later the Russian Empire) are the Liparitids and the T’umanids. The former appeared in Iberia c. 876 and was invested with the office of High Constable of Georgia. It returned, to Armenia in 1177, or possibly even earlier and reigned as the Third Dynasty of Siunik from c. 1200 to the mid-fifteenth century. It was subdivided, in the remaining Georgian branch, into the following houses: Jambakur(ian) [= čenbakur]-Orbeliani, Barat’ašvili, Solağašvili, Kaxaberije-Čiĵavaje, and possibly Abašije. The other house of T’umanids, moved back to Georgia from Armenia Maritima (Cilicia) after the twelfth century and adopted the last name Toumanishvili. They were acknowledged by the Kings of Georgia as tavadi (princes), and received hereditary rank as the King's "mdivanbeg" (counselor or vizier).
The House of Tumanishvili was on the list of Kartvelian (Georgian) princes that was attached to the Treaty of Georgievsk concluded with the Georgian King Erekle II on July 24, 1783 and on recognized on the Russian Empire's list of princely families in December 1850.
The Prince Mikhail Tumanov was the Ambassador (Minister plenipotentiary) of Armenia to Georgia during the first republic of Armenia.