This is fascinating! Not only is the woman carrying a dagger, but she also appears to be in male dress and her hair is very plain compared with the usul hairdos of the upper classes at the time. Apart from the fact that the medal portrait of Lucrezia (and an engraving of the same period) show her with more of a double chin, it could well be her and shows her looking more like her mother than we've tended to think hitherto. The three boys were all supposed to look like Vannozza, and Lucrezia like her father. But what interests me the most about this is that the subject's pose and costume mirrors very closely the only portrait of her brother Cesare which has come anywhere close to being authenticated. For those who've read 'The Book of Love', you'll see why this excites me. For those who heaven't, well, you know what to do...