She was the daughter of the Genuese noble Carlo Fieschi, count of Savignone, while mother was Teodora of Bourbon[1] allegedly a relative of Charles II of Naples.
Isabellas other important family connections included being a great-niece (through her father) of the pope Adrian V.Isabella was also a maternal cousin of Beatrice d’Este, the widow of Galeazzo I Visconti and mother of Azzone the ruling lord of Milan.
As Azzone, her husband Luchinos nephew was the lord of Milan, Isabella only became Lady of Milan on her husbands assuming the title after Azzones death in 1339.
During her visit, she participated in an orgy during which she had sexual intercourse with three men at the same time, among them being Andrea Dandolo, the Doge of Venice, and the nephew of her spouse, Galeazzo II Visconti.
[2] After the death of Visconti, Isabella was forced to give up her son's rights to power in Milan and was placed under house arrest.