The Greben or Skoi Cossack host was a group of Cossacks formed in the 16th century from Don Cossacks who left the Don area and settled in the northern foothills of the Caucasus. The Greben Cossacks are part of the Terek Cossacks.They were influenced by Chechen and Nogai culture and most were bilingual in the Russian language and the Nogai language.
References
Greben Cossacks Wikipedia(Text) CC BY-SA