イザボー・ド・バヴィエール
Her niece, Isabeau of Bavaria, daughter of her eldest sister, Taddea, was a Queen consort of France upon her marriage in 1385 to King Charles VI. Following the murder of her maternal grandfather, Isabeau became one of the most implacable enemies of Caterina's husband Gian Galeazzo and his daughter, Valentina, Duchess of Orleans.