labeled this photo "Four Bears", Dakota, but
I think it is more likely Red Feather, Sans Arc. According
to the Smithsonian it was taken by photographers Hamilton
& Hoyt of Sioux City.
picture is from a series of delegation photographs taken
in the early 1870s (1871?). The delegates were from Cheyenne
River Reservation. The other photos I am aware of this
series are of Charger (aka Martin Charger, Sans Arc),
Four Bears (a/k/a Joseph Four Bears, Two Kettle) and White
Swan (a/k/a Little White Swan, Minikoju).
was a Red Feather, Wiyaka-luta, who signed the
Treaty of 1876 among other known Sans Arcs like Crow Feather,
Charger and Yellow Hawk. It could be him in the photograph.
— Dietmar Schulte-Möhring