Apollinaire included a letter from this group to a sovereign in his La Chanson du Mal-Aim? and a member of this group kills a
Apollinaire included a letter from this group to a sovereign in his La Chanson du Mal-Aim? and a member of this group kills a princess and two of her sons out of love for Helena in Sienkiewicz's With Fire and Sword. Another literary member of this group hides under bricks to see his son before that son is executed, and one named Petlyura is rumored to be in charge of an advancing army in Bulgakov's The White Guard. In a poem by Byron, a title character belonging to this group is exiled out of love for Theresa, and Olyenin's life among these titular people was recounted in a novel by Tolstoy.  FTP, identify these people living in the Don region, who were written about by Sholokhov and examples of which include Gogol's Taras Bulba and Byron's Mazeppa.
Apollinaire included a letter from this group to a sovereign in his La Chanson du Mal-Aim? and a member of this group kills a princess and two of her sons out of love for Helena in Sienkiewicz's With Fire and Sword.
Cossacks or Kazakhi