One of several piano sonatas, the Mondscheinsonate, dedicated to one of Beethoven's numerous botched romances, Countess Giulietta Guicciardi. It's not so much that she turned him down, rather, one of her parents, possibly her father, forbade her to marry the then thirty year old piano virtuoso.
All in all a rather tragic life, actually. Despite this, a prodigious if intermittent output.
Dead White Male.