Zelgius, also known as the Black Knight, is a central character in Fire Emblem: Path of Radiance, and its sequel, Radiant Dawn. A former student of the legendary swordsman Greil, Zelgius later kills Greil, beginning a fierce rivalry between himself and Ike. As one of the Four Riders of Daein, he seemingly serves the Mad King Ashnard, but his true allegiance belongs to the corrupt bishop, Sephiran. Zelgius is a steadfast, loyal swordsman who takes pride in his skills, unflinchingly seeking a challenger worthy of providing the duel that Greil could not. As a Branded, he ages slowly than most humans.