On 28 January 2010, Sotheby’s New York will offer a painting that has been at the center of one of the art world’s most heated debates for over eighty years: Portrait of a Woman, called "La Belle Ferronnière" by a follower of Leonardo da Vinci (est. $300/500,000). Depicting a lady in three-quarters profile, the portrait is another version of a composition in the Louvre, now believed to be by either Leonardo or one of his pupils, depicting Lucrezia Crivelli, a mistress of Ludovico Sforza, the Duke of Milan. Since the widely publicized 1929 slander trial of the art world’s foremost international expert, Sir Joseph Duveen, "La Belle Ferronnière’s" attribution has been fiercely contested, raising questions of connoisseurship, authenticity, and the role of science in art history in the 21st Century. The picture’s intricate story has fascinated readers for decades; the trial was closely followed by 'Time and New York Times' readers in the 1920s and is today the subject of a recently published book, 'The American Leonardo: A Tale of Obsession, Art and Money', written by John Brewer. After decades out of public view, La Belle Ferronnière will be exhibited at Sotheby’s Los Angeles office on 13 January and at Sotheby’s New York galleries beginning 23 January 2010.