Art historians at PinocatecaBiblioteca Ambrosiana say its a Leonardo   The official placard at the museum where this painting is held does not mention anything at all about de Predis  I cant unearth any recent art historians who diagree with them  At this point since the museum is very specific about handprintsfingerprints unless someone can find a way to work de Predis back into this article  this portrait entitled simply Duchess of Milan is a Leonardo  And yes it is most likely a portrait given to Beatrice at her wedding where Leonardo was the wedding designer and made party favors and was highly involved in all of itLeValley