Bass Reeves

 was a United States Deputy Marshal and former slave.

He was rumoured to have knocked out his owner and ran north on the outset of the American Civil War. After the end of the war, there was no longer slavery in the United States. As a Deputy Marshal, Reeves, aided by the scout Joey Two Trees, went into the Indian Territory to track down wanted men. In 1880, they saved Bill Potts from being held hostage by the wanted killer Seth Shelton, and had Shelton arrested, intending him to be taken to Arkansas to stand trial. Joey showed the Twelfth Doctor and Reeves that a stag had its heart ripped out of its body. (COMIC: The Parliament of Fear)