Sitting Bull

Sitting Bull (c. 1831 – December 15, 1890) was a Lakota chief during the early years of the United States of America. He is famous for saving his people by relocating his tribe to Canada.

On Arthur
He spent some time as part of Buffalo Bill's Traveling show where he visited Elwood City in a flashback in the episode "On This Spot." He also appeared to Arthur as a spirit for inspiration so he could create a historical landmark in Elwood City.