Boniak (Bönek, or Maniak) Khan was a Cuman khan who led the invasions, together with Togortac, on Kievan Rus'. In 1096 Boniak attacked Kiev, plundered the Kiev Monastery of the Caves, and burned down the prince's palace in Berestovo. He was defeated in 1107 by the princes of Rus's forces, near Lubni. He is mentioned for the last time in the Primary Chronicle in 1167, when he was defeated by Prince Oleg I of Chernigov.
Boniak is often represented as a sorcerer in Rus' folklore.[1]