The poem features Alfonso II d'Este, reflecting his pride, jealousy, and power over his last duchess, as he presents her painting to an emissary. Through a dramatic monologue, the duke reveals his overbearing nature and the underlying themes of control, social status, and jealousy linked to his deceased wife. The poem's structure and language create a conversational yet pompous tone, illustrating the complexities of the duke's character and his relationships.