Bells have played a fundamental role not only in the Sienese people's daily lives but also in the most significant events in the city's history. The catalogue prepared by the author tells us, for instance, that particularly on account of the inscriptions engraved in the bronze, a bell can offer us a huge amount of information regarding historical events, dates, dedications, the name of the patrons who commissioned it,  the bronzesmiths who cast it and so on.