Cinder is an enigmatic man who cannot die. In his very first appearance, Cinder was presented as an assassin who has been just executed. Some mysterious lead-eyes men are awaiting his resurrection from the grave, planning to use his brain for a horrifying experiment. Winston, called by supernatural messages, comes to save him. Cinder has lived since ancient times, and took part in many famous historical episodes including the building of the Tower of Babel, World War I and the Battle of Thermopylae. His origin, as well as his unearthly skills, were never explained by the authors through. He as been described as "an unquiet conscience of humanity, a witness, sometimes sorrowfully torpid, of the great and small events of the Man, though often a rebellious one who never surrendered to those trying to silence him" (Alessio Lega).
Source