Its origins date back to 1531, when Count Antonio III Moncada founded a monastery next to a pre-existing church dedicated to Saint Mary of the Snow. In 1590, thanks to a relic donated by Countess Moncada—a fragment of the True Cross of Christ—the entire complex took its present name, which still recalls its devotional and historical significance. The religious building is marked by a sober and solemn 17th-century façade, made of local sandstone blocks. Long latticed windows punctuate the main front, lending rhythm and visual lightness to the otherwise rigorous architectural structure. The interior has a single nave, reminiscent of monastic models, designed to draw the gaze toward the high altar and the relic preserved in the transept. Over the centuries, the monastery and church underwent expansions and transformations: in 1618 new workshops and rooms for the nuns were added, while in 1625 a south-facing terrace was raised for recreational or contemplative use. The transfer of the Benedictines to the Jesuit College in 1780 marked a period of decline, although a restoration carried out in 1807 by Vincenzo Barile allowed the return of the monastic community until the 19th-century suppressions. In 1924, by will of Bishop Giovanni Iacono, the church was granted the status of parish, thereby assuming a new pastoral role in the urban community. Preserved as a cultural asset, today the complex is an integral part of Caltanissetta’s historical and artistic heritage and is promoted within the city’s tourist and cultural itineraries, especially during visits to the historic “Badia.”