King of Mars

Abraham "Abe" Lincoln was the King of Mars who debuts in the original animated short, where he encourages Finn to believe in himself after warping his brain in the past and to Mars. His first appearance in the official series is in one of the framed pictures in Hunson Abadeer's house. Lincoln plays a major role in the episode "Sons of Mars," where he loses his immortality (and seemingly his life) in order to save Jake after he was accidentally killed and sent to the 37th Dead World. As a result, Lincoln turns to stone and becomes a statue for all of eternity.