Juan de Castilla son of Fernando III of Castile and Juana de Ponthieu (1246–1246) Parents Joan, Countess of Ponthieu Ferdinand III of Castille Children Siblings Simon of Castille Eleanor of Castile Luigi di Castiglia Ferdinand, Count of Aumale Ferdinando di Castiglia Frederick of Castile Alfonso X of Castile and Leon Leonor de Castilla Manuel of Castile Maria de Castilla Berenguela de Castilla Philip of Castile Sancho of Castile Infante Henry of Castile