Alonso Quijano is a fictional character from the novel Don Quixote, written by Miguel de Cervantes. He is a middle-aged gentleman from La Mancha, Spain, who becomes obsessed with chivalric romances. This obsession leads him to adopt the persona of a knight-errant, renaming himself Don Quixote. In his quest for adventure, Alonso Quijano sets out to revive chivalry and protect the helpless. His delusions often result in humorous situations, as he misinterprets ordinary objects and events as grand quests. Ultimately, he embodies the themes of idealism versus reality in literature.