There were no woman called Bianca Gonzaga, marquess of Mantua. Francesco Gonzaga's wife was the famous Isabella d'Este (from the powerful Ferrara ducal family), patron of the arts and leader of fashion, whose style of dressing was copied by women.
Caterina Sforza's eldest son's name was Ottaviano, not Benito. None of her sons were named Benito; in fact, Benito is not even an Italian name, but Spanish. The most prominent Italian named Benito, Benito Mussolini, was named after Mexican president Benito Juarez.