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

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...

, 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. As a religious reformer, he encouraged the migration of Jews

Jews

The Jews , also known as the Jewish people, are a nation and ethnoreligious group originating in the Israelites or Hebrews of the Ancient Near East. The Jewish ethnicity, nationality, and religion are strongly interrelated, as Judaism is the traditional faith of the Jewish nation...

 to Khazaria, built yeshivot, and promoted Rabbinic beliefs. He was succeeded by his son Hezekiah

Hezekiah (Khazar)

Hezekiah ben Obadiah was the ruler of the Khazars, probably in the mid ninth century CE. He was the son of Obadiah, the descendant of Bulan who brought rabbinical scholars to and built yeshivot in Khazaria. Little is known about Hezekiah's reign...

.

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.