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"/>After the murder of Galeazzo Maria, Duchess Bona ruled Milan as regent for two years and eight months. She was a foolish and stupid woman called a dame de petit sens by Commines. During her regency actual power was held by Cecco Simonetta, former secretary to Francesco Sforza and the brother of Francesco’s biographer, Giovanni Simonetta. This situation did not please the late duke’s brothers.