Gian Galeazzo Visconti

Gian Galeazzo Visconti (16 October 1351 – 3 September 1402), was the first duke of Milan (1395) and ruled that late-medieval city just before the dawn of the Renaissance. He also ruled Lombardy jointly with his uncle Bernabò. He was the founding patron of the Certosa di Pavia, completing the Visconti Castle at Pavia begun by his father and furthering work on the Duomo of Milan. He conquered a large area in the Po Valley of northern Italy. He threatened war with France in relation to the transfer of Genoa to French control as well as issues with his beloved daughter Valentina. When he died of fever in the Castello of Melegnano, his children fought with each other and fragmented the territories that he had ruled.

Source: Wikipedia — https://en.wikipedia.org/wiki/Gian_Galeazzo_Visconti