Man of La Mancha is a 1972 film adaptation of the Broadway musical Man of La Mancha by Dale Wasserman, with music by Mitch Leigh and lyrics by Joe Darion. The musical was suggested by the classic novel Don Quixote by Miguel de Cervantes, but more directly based on Wasserman's 1959 non-musical television play, I, Don Quixote, which combines a semi-fictional episode from the life of Cervantes with scenes from his novel. Wikipedia
Miguel de Cervantes: It is imperative each knight has a lady; a knight without a lady is a body without a soul. To whom would he dedicate his conquests? What visions sustain him when he sallies forth to do battle with evil and with giants?