The presence of a Cassero in Lucignano confirms the strategic military importance that the town had in the modern age. For many centuries Lucignano has marked the border between the provinces of Siena and Arezzo, with an absolutely privileged position in the heart of Valdichiana and therefore it has always been of vital importance in the expansionist aims of the powers of various eras.
The origin of the Cassero dates back to the fourteenth century, when Lucignano was under the Siena dominion, whose function was exclusively defensive. This is confirmed by the presence of two coats of arms depicted on the internal façade, respectively the black-white balzana symbol of Siena and a rampant lion of the Capitano del Popolo, they confirm the dominion of Siena over Lucignano. However, after the Siena defeat in the battle of Scannagallo, the Cassero took on the function of a grain deposit and later, in the mid-1800s, it housed a theater.
In front of the fort there is Piazza delle Logge, commissioned by Cosimo I de' Medici in the aftermath of the Battle of Scannagallo for the urban completion of the town, therefore making the chosen space the heart of the village. It is no coincidence that in the loggia it is possible to see the three symbols of the city authorities, namely religious, civil and military symbols.
The upper part of the loggia is also special, it is a real balcony on the square which also has the function of connecting the oldest part of the village of Lucignano to the more recent one, near the walls.