now in London, in the collection of the Royal Academy. Eleven other copies, by various pupils of Leonardo, painted either during his lifetime or within a few years after his death, while the picture was in perfect preservation, exist in different churches and collections.

While engaged on the Cenacolo, Leonardo painted the portrait of Lucrezia Crivelli, now in the Louvre (No. 483). It has been engraved under the title of La Belle Ferronnière, but later researches leave us no doubt that it represents Lucrezia Crivelli, a beautiful favorite of Ludovico Sforza, and was painted at Milan in 1497. It is, as a work of art, of such extraordinary perfection that all critical admiration is lost in wonder.

Of the grand equestrian statue of Francesco Sforza, Leonardo never finished more than the model in clay, which was considered a masterpiece. Some years afterward (in 1499), when Milan was invaded by the French, it was used as a target by the Gascon bowmen, and completely destroyed. The profound anatomical studies which Leonardo made for this work still exist.