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 information is available about Menasseh's reign. Like other Bulanid rulers, it is unclear whether he was a Khagan or a Khagan Bek of the Khazars, with the latter being more likely. The credibility and accuracy of the only document mentioning his name have been disputed.