Is this Lucrezia Borgia?

Lucrezia Borgia is the most infamous member of one of the Renaissance’s best known families, the Borgias, thanks to a popular, but probably entirely false, reputation as a poisoner. Until now there were thought to be no surviving formal portraits of her, but the National Gallery of Victoria in Australia is claiming to have identified a painting in its collection as that of Lucrezia. Previously thought to have been of a male because the subject is holding a dagger, the picture has also been identified as the work of Dosso Dossi, painted between 1515 – 20. “The Independent” has a good reproduction online.