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Why are Don Quixote and Sancho Panza among the best-known fictional characters in literature?

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Engraving of Miguel de Cervantes, shown with a mustache and beard, wearing a ruffled collar and cloak, based on works by Gregorio Ferro and Fernando Selma. — Miguel de Cervantes Miguel de Cervantes, engraving by E. Mackenzie after Gregorio Ferro and Fernando Selma; from *The Imperial Dictionary of Universal Biography* (1863).

Don Quixote and Sancho Panza are among the most iconic characters in literature because they serve as a foundational "dualistic" pairing that explores the fundamental human conflict between reality and illusion.12

Miguel de Cervantes utilized their psychological differences to drive the narrative of his masterpiece, Don Quixote, which is widely considered the first modern novel. Their relationship is defined by contrast:134
* Don Quixote represents mad idealism and the impractical pursuit of chivalric goals, becoming an archetype for anyone who is "quixotic"—foolishly idealistic or rash.135
* Sancho Panza acts as a foil to his master, providing common sense, vulgar wit, and a grounded perspective through his frequent use of proverbs.1

Their physical and symbolic differences—recalling the medieval contrast between the expansive, materialist Carnival and the self-denying Lent—allow Cervantes to examine diverse perspectives. Because of their depth and the novel's nuanced irony, these characters have transcended the page, appearing continually across the cultural landscape in theatre, film, and art for centuries.62