In 1496, Cardinal Raffaele Riario, a voracious collector of Roman antiquities, added to his collection a marble sculpture of a sleeping Eros, god of love. The cardinal had purchased the sculpture through art dealer Baldassarre del Milanese, who made a reported 200 ducats on the sale. Despite its aged appearance, however, the sculpture was not a true Roman antique, but rather a forgery created just months prior by a then-relatively-unknown 21-year-old Florentine sculptor. Who could have crafted a forgery so convincing as to deceive the informed eye of an avid, if not overly knowledgeable, collector? None other than Michelangelo…