Small boy who provokes much of the action in the Breton legend of the city of Ys. After casting stones in the water with a crooked stick, Kristof catches a magical fish who offers riches in exchange for his liberty. Princess Dahut mocks this exchange, and so the fish casts a spell on her, making her pregnant with a son who can claim no father. Dahut's father, Gradlon, puts Dahut, Kristof, and the baby boy in a cask and sets them out to sea, when the magical fish causes first a palace and then a city to appear. During this time Ys is engulfed because Kristof has taken away the protective oak.