This volume examines the sources, content and fate of the 15th century allegorical fable "Vision Deleytable" from three angles: as a medieval compendium of religious philosophy, a major influence in Spanish literature and a historical resource on Jewish-Christian interactions in medieval Spain. It is divided into three sections. The first part considers "Vision"'s didacticism within the Jewish and Christian frames of education in 15th century Spain. The second part reviews "Vision"'s philosophical content in comprehensive articulation of a rationalist "Weltanschauung". The final section traces its editorial fate and literary influence through the 17th century in Spain, Italy and the Netherlands.