The frescoes are part of a cycle consisting of six medallions and another mutilated fragment, depicting the seven Liberal Arts, according to the iconography established in the 5th century AD by the African grammarian Marziano Capella in De nuptiis Mercurii et Philologiae: Grammar, Dialectic, Rhetoric, Geometry, Arithmetic, Astronomy and Music.
Rhetoric is depicted as a thriving gentlewoman dressed up as a warrior with helmet, shield and sword.