If it really was Queen Elizabeth who demanded to see Falstaff in a comedy, then she showed herself a very perceptive critic. But even in The Merry Wives of Windsor, Falstaff has not and could not have found his true home because Shakespeare was only a poet. For that he was to wait nearly two hundred years till Verdi wrote his last opera. Falstaff is not the only case of a character whose true home is the world of music; others are Tristan, Isolde and Don Giovanni.
