Hezekiah ben Obadiah was the ruler of the Khazars

Khazars

The Khazars were semi-nomadic Turkic people who established one of the largest polities of medieval Eurasia, with the capital of Atil and territory comprising much of modern-day European Russia, western Kazakhstan, eastern Ukraine, Azerbaijan, large portions of the northern Caucasus , parts of...

, probably in the mid ninth century CE. He was the son of Obadiah

Obadiah (Khazar)

Obadiah was the name of a Khazar ruler of the late eighth or early ninth century. He is described as coming from among "the sons of the sons" of Bulan, but whether this should be taken literally to mean that he was Bulan's grandson, or figuratively to imply a more remote descent, is unclear...

, the descendant of Bulan

Bulan (Khazar)

Bulan was a Khazar king who led the conversion of the Khazars to Judaism. His name means "elk" in Old Turkic. The date of his reign is unknown, as the date of the conversion is hotly disputed, though it is certain that Bulan reigned some time between the mid-700s and the mid-800s. Nor is it settled...

 who brought rabbi

Rabbi

In Judaism, a rabbi is a teacher of Torah. This title derives from the Hebrew word רבי , meaning "My Master" , which is the way a student would address a master of Torah...

nical scholars to and built yeshivot in Khazaria. Little is known about Hezekiah's reign. As with other Bulanid rulers, it is unclear whether Hezekiah was 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...

 or 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,...

 of the Khazars, although the latter is more likely.

Hezekiah was succeeded by his son Menasseh I.

Sources

• Kevin Alan Brook. The Jews of Khazaria. 2nd ed. Rowman & Littlefield Publishers, Inc, 2006.
• Douglas M. Dunlop, The History of the Jewish Khazars, Princeton, N.J.: Princeton University Press, 1954.
• Norman Golb
  Norman Golb
  Norman Golb is the Ludwig Rosenberger Professor in Jewish History and Civilization at the Oriental Institute of the University of Chicago. He earned his PhD from Johns Hopkins University in 1954. He joined the faculty of the Hebrew Union College, Cincinnati in 1958 before settling at the...
  
   and 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...
  
  , Khazarian Hebrew Documents of the Tenth Century. Ithaca: Cornell Univ. Press, 1982.