131 – Milan, chaos in the duchy (1402 – 1412)

After the untimely death of the first duke of Milan, Gian Galeazzo Visconti, the duchy is thrown into turmoil as the widow, Caterina Visconti attempts to hold onto the realm of her sons, Giovanni Maria and Filippo Maria through internal intrigue and external military pressure from Florence, Venice and many others trying to take advantage of Milan's moment of weakness.