Little is known about his reign. As with other Bulanid rulers, it is unclear whether Menasseh was Khagan or Khagan Bek of the Khazars, although the latter is more likely. Historical authenticity and accuracy  of the only document mentioning his name has been questioned.
Limited knowledge exists about Menasseh's reign. Similar to other Bulanid leaders, it remains unclear whether he was a ruler or held a specific title, such as Khagan Bek of the Khazars, which is more likely. The historical record's credibility and accuracy regarding his name have been disputed.