'Denizens' mean tigers. Tigers live in the forests where they are free from constraints. 'Chivalric' means brave and fearless. The tigers are embroidered in tapestries by Aunt Jennifer herself. The tigers are all depicted as dominant, active, brightly hued - a complete contrast to Aunt Jennifer. They are unafraid of hunters and are brave and confident. 'Denizens pacing in sleek certainty' finely brings out the contrast between Aunt Jennifer herself and her artwork.