Geoffrey of Vinsauf (fl. 1200) is a representative of the early medieval grammarian movement, termed preceptive grammar for its interest in teaching . Ars poetria is a subdivision of the grammatical art (ars grammatica) which synthesizes "rhetorical" and "grammatical" elements. The line of demarcation between these two fields is not firmly established in the Middle Ages. Gallo explains that "both of these liberal arts taught composition and taught the student to examine the diction, figurative language, and meters of the curriculum authors who were to serve as models for imitation. However it was rhetoric and not grammar that was concerned with Invention of subject matter and with disposition or organization of the work" as well as memory and delivery.