After the unification of Italy in the 19th century the Papal States had become formally part of the Kingdom of Italy, but the Vatican disputed this claim of geographic authority, and the Papacy continued to exercise de facto political control over an area around St Peter's Basilica in Rome.

After the unification of Italy in the 19th century, Prato became a primary industrial centre, especially in the textile sector ( Italian historian Emanuele Repetti described it as the " Italian Manchester "), and population grew up to 50, 000 in 1901 and to 180, 000 in 2001.

After the unification of Italy in the 19th century, the restoration of the castle was started following its transfer from military use to the city of Milan.

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