ジャン・ガレアッツォ・ヴィスコンティ
Valentina was born in Milan as the second of the four children of Gian Galeazzo Visconti, the first Duke of Milan, and his first wife Isabelle, a daughter of King John II the Good of France. She was probably named after her paternal great-grandmother Valentina Doria, wife of Stefano Visconti.