Boniak.Cuman khan who led invasions on Kyivan Rus’ in 1096, 1097, 1105, and 1107. In 1096 Boniak attacked Kyiv, burned down the princely palace in Berestove, and plundered the Kyivan Cave Monastery. In 1107 he was defeated by the Kyivan Rus’ princes' forces near Lubny.
[This article originally appeared in the Encyclopedia of Ukraine, vol. 1 (1984).]