Khan-Tuvan Dyggvi, according to Omeljan Pritsak

Omeljan Pritsak

Omeljan Pritsak was the first Mykhailo Hrushevsky Professor of Ukrainian History at Harvard University and the founder and first director of the Harvard Ukrainian Research Institute.-Career:Pritsak began his academic career at the University of Lvov in interwar Poland where he...

, was the name of a Khazar khagan

Khagan

Khagan or qagan , alternatively spelled kagan, khaghan, qaghan, or chagan, is a title of imperial rank in the Mongolian and Turkic languages equal to the status of emperor and someone who rules a khaganate...

 of the mid 830s. He led a rebellion of the Kabars against the Khagan Bek

Khagan Bek

-History:Khazar kingship was divided between the khagan and the Bek or Khagan Bek. Contemporary Arab historians related that the Khagan was purely a spiritual ruler or figurehead with limited powers, while the Bek was responsible for administration and military affairs.In the Khazar Correspondence,...

. As this rebellion took place roughly contemporaneously with the conversion of the Khazars to Judaism

Judaism

Judaism ) is the "religion, philosophy, and way of life" of the Jewish people...

, Pritsak and others have speculated that the rebellion had a religious aspect.
Omeljan Pritsak

Omeljan Pritsak

Omeljan Pritsak was the first Mykhailo Hrushevsky Professor of Ukrainian History at Harvard University and the founder and first director of the Harvard Ukrainian Research Institute.-Career:Pritsak began his academic career at the University of Lvov in interwar Poland where he...

 speculated that a Khazar khagan named Khan-Tuvan Dyggvi, exiled after losing a civil war, settled with his followers in the Norse-Slavic settlement of Rostov, married into the local Scandinavian nobility, and fathered the dynasty of the Rus' khagans. Zuckerman dismisses Pritsak's theory as untenable speculation, and no record of any Khazar khagan fleeing to find refuge among the Rus' exists in contemporaneous sources. Nevertheless, the possible Khazar connection to early Rus' monarchs is supported by the use of a stylized trident

Coat of arms of Ukraine

The state coat of arms of Ukraine or commonly the Tryzub is the national coat of arms of Ukraine, featuring the same colors found on the Ukrainian flag; a blue shield with yellow trident, called the tryzub...

 tamga, or seal, by later Rus' rulers such as Sviatoslav I of Kiev

Sviatoslav I of Kiev

Sviatoslav I Igorevich ; , also spelled Svyatoslav, was a prince of Rus...

; similar tamgas are found in ruins that are definitively Khazar in origin.