The Knight of the Sorrowful Countenance is turning 400. By some accounts, the first part of Don Quixote, Miguel de Cervantes's masterpiece, was available in Valladolid by Christmas Eve 1604, although Madrid did not get copies until January 1605. Thus came to life the "ingenious gentleman" who, ill equipped with antiquated armor "stained with rust and covered with mildew," with an improvised helmet, atop an ancient nag "with more cracks than his master's pate," went out into a decaying world where there were plenty of "evils to undo, wrongs to right, injustices to correct, abuses to ameliorate, and offenses to rectify." In this article, the author reflects on Cervantes's novel Don Quixote, and discusses why it is still conquering hearts.