The protagonists

Investitur of Vitaliano I Borromeo

Vitaliano I, founder of the Borromeo family, having become general treasurer of the Duchy of Milan, was named count of the fiefdom of Arona and subsequently Marquis of Angera by Filippo Maria Visconti. The castles of Angera and Arona were important military strongholds to defend the Milanese grand duchy.