Piacenza

Piacenza was a city on the Po in northern Italy and a free commune from 1126. Milan's Visconti ended Alberto Scoto's rule in 1313 and held the city in 1337.

After Visconti, Sforza and French rule, Piacenza entered the Papal States in 1521. Pope Paul III made it part of a duchy for his son Pier Luigi Farnese in 1545. The Farnese ruled until their male line ended in 1731; the duchy was ceded to France in 1801, and the Congress of Vienna assigned it to Marie Louise in 1815.