The history of Castelnuovo Berardenga is closely linked to the cult of the Madonna del Patrocinio. As early as 1367, the Virgin was thanked for the fortifications built by Siena to defend the town from looting during the struggles between Florence and Siena. Miraculous healings have long been attributed to the Madonna, including, more recently, the providential error of a military charter which, in 1944, brought a strong contingent of British troops into the area that freed the country from the Germans, who didn’t succeed in detonating the mines as planned.
The Sanctuary of Maria Santissima del Patrocinio (built in 1680) has a gabled façade with travertine slabs lining the lower part, while the upper section is plastered. It was built according to a Latin cross plan, withchapels along the arms of the transept. The vaulted roof is supported by semi-pillars leaning against the walls and bordered by round arches. Of particular interest are a wooden compass, the orchestra supported by marble columns, a stucco decorated parapet, the travertine balustrade and the evocative altar with the image of the Madonna and Child in terracotta. This venerated effigy now kept in the Church of the Compagnia was originally placed in a "majesty".