Between her birth in 1463 as the illegitimate daughter of the Duke of Milan, and her death in 1509 as a member of the powerful Medici family, the life of Caterina Sforza crossed the firmament of Renaissance Italy like a shooting star. She was painted by Botticelli, feted by Pope Sixtus IV, slandered by Macchiavelli and celebrated as a warrior who led her own troops fearlessly into battle. While defending her fortress city-state of Forlì, she was prepared to sacrifice her children rather than sur...