"The Italian city-states were a political phenomenon of small independent states mostly in the central and northern Italian peninsula between the 10th and 15th centuries. Many of these towns were survivors of earlier Etruscan and Roman towns which had existed within the Roman Empire but by the 11th century, many cities, including Venice, Milan, Florence, Genoa, Pisa, Siena, Lucca, Cremona and many others, had become large trading metropolises, able to conquer independence from their formal sovereigns.
The first Italian city-states appeared in northern Italy as a result of a struggle to gain independence from the German Holy Roman Empire. The Lombard League was an alliance formed around 1167, which at its apex included most of the cities of northern Italy including, among others, Milan, Piacenza, Cremona, Mantua, Crema, Bergamo, Brescia, Bologna, Padua, Treviso, Vicenza, Venice, Verona, Lodi, Reggio Emilia and Parma, though its membership changed through time. Other city-states were associated to these "commune" cities, like Genoa, Turin and, in the Adriatic, Ragusa.
In central Italy there were the city-states of Florence, Pisa, Lucca, Siena and Ancona, while south of Rome and the Papal States there were the city-states of Salerno, Amalfi, Bari, Naples and Trani which in 1130 were united in the newly-created Norman Kingdom of Sicily…"
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