Bona of Savoy, Duchess of Milan was Duchess of Milan as the second spouse of Galeazzo Maria Sforza, Duke of Milan. She served as regent of Milan during the minority of her son 1476–1481.
Bona of Savoy
Galeazzo Maria Sforza was the fifth Duke of Milan from 1466 until 1476. He was notorious for being lustful, cruel, and tyrannical.
Galeazzo Sforza, by Piero Benci, Uffizi Gallery
Lament of the duke Galeazzo Maria (1476).
Lampugnani's Conspiracy by Francesco Hayez, 1826