Comte de Rochefort - in "The Three Musketeers"

In "The Three Musketeers"

Known throughout the novel as "The Man from Meung", his first appearance is in the opening chapter of The Three Musketeers. He insults d'Artagnan and steals his letter of recommendation to Monsieur Treville, causing d'Artagnan to swear revenge.

He reappears from time to time, poping up, like a jack-in a box, whenever he isn't wanted, as the story progresses; d'Artagnan regularly sees Rochefort and tries to catch him,however, he vanisheses into the streetcorner crowds of Paris, skillfull, and never gets to actually meet him again and learn his name until the end of the novel. It is Rochefort who kidnaps Constance Bonacieux, and we eventually learn that he is the other main agent (in addition to Milady de Winter) of Cardinal Richelieu. He is sent by Richelieu to escort Milady de Winter in some of her missions. At the end of the novel, Rochefort tries to arrest d'Artagnan for the cardinal, who eventually orders the two men to become friends. In the Epilogue, we learn that Rochefort, and an older and wiser d'Artagnan, have fought on three occasions (all duels being won by d'Artagnan), settle their differences and become friends.