Not positive, but I belive that is the czars son, grand duke alexis and his bodyguard with buffalo bill. Doing my genelogy I have read several accounts of my gr, gr grandfather was a guard to the czar, but I dont know which one or how far back. I have also seen a picture of custer with them. They were here in I belive 1872 along with general sheridan on a big buffalo hunt.

http://www.eyewitnesstohistory.com/buffalobill.htm

http://custerlives.com/custer16.htm