https://s3-euw1-ap-pe-df-pch-content-public-u.s3.eu-west-1.amazonaws.com/9780429292354/3abb420d-80da-4aed-a9cf-ae5c42b997f9/content/ifig0001.tif"/>The assassination of Galeazzo Maria Sforza left the Duchy of Milan to be ruled by his foolish and emotional widow, Bona of Savoy, who became regent. The murdered duke left four legitimate children: Giovanni Galeazzo (always called Gian Galeazzo), now titular duke, aged seven; Ermes; Bianca Maria and Anna. Galeazzo Maria had also found time to father illegitimate children, of whom one, Caterina, became one of the most famous members of the Sforza family and the second most famous woman of the Italian Renaissance who was exceeded in enduring celebrity only by Isabella d’Este.