Isaac ben Hanukkah was a hypothetical Jewish ruler of the Khazars mentioned in the Khazar Correspondence. He probably reigned in the mid to late ninth century CE. Little is known about his reign. As with other Bulanid rulers, it is unclear whether Isaac was Khagan or Khagan Bek of the Khazars, although the latter is more likely. He was succeeded by his son Zebulun. Historical authenticity and accuracy of the only document mentioning his name has been questioned.^[1]