He is one of the Three --lieutenants of Satoris that were made immortal -- He came to Satoris after murdering his wife and his king who had an affair and a child together -- an act that earned him the name "Kingslayer."
One of the Three Immortals, he was brought to Satoris after slaying his wife and the king with whom she had an illicit relationship and a child, earning him the moniker "Kingslayer."