Located in the Val Seriana, it received the honorary title of city on 15 May 1957 with a presidential decree which ratified a Napoleon's promise of the year 1801.

[4] Later, in the Roman period, the village became a center of greater importance in the entire district, including the construction of fortifications.

The first written document which mentions Clusone dates from 774, in a deed that recorded the grant of the nucleus of the rocca (fortress) by Charlemagne to the monks of Saint Martin of Tours.

The fortress grew considerably in medieval times, so as to assume the appearance of a real castle, with walls and towers for defensive purposes.

A branch of the noble Aliprandi family of Milan, that assumed the surname Fanzago in place of that original, moved to Clusone at the end of the 14th century.