Montresor is the protagonist in Edgar Allan Poe's short story "The Cask of Amontillado." He is a wealthy Italian nobleman who seeks revenge against his acquaintance, Fortunato, for an unspecified insult. Montresor is cunning and manipulative, using his knowledge of Fortunato's pride in wine to lure him into a trap. Throughout the story, Montresor's character is marked by his cold calculation and lack of remorse. He meticulously plans Fortunato's demise, leading him into the catacombs under the guise of tasting a rare wine, Amontillado. Montresor's actions raise questions about morality and the nature of revenge.