Bianca Maria Visconti, Duchess of Milan (b. 1425)
Bianca Maria Visconti (31 March 1425 – 28 October 1468) was Duchess of Milan from 1450 to 1468 by marriage to Francesco I Sforza. She was regent of Marche during the absence of her spouse in 1448. She served as Regent of the Duchy of Milan during the illness of her spouse in 1462, as well as in 1466, between the death of her spouse and until her son, the new Duke, who was absent, was able to return to Milan to assume power.