 To Cesare Nebbia, a native of Orvieto (1536–1614), can be attributed the frescoes in the dome and apse curve in which are reproduced some scenes from the life of the saint.The altarpiece of the high altar, depicting the beheading of St. Susanna, is by Tommaso Laureti of Palermo (1530–1602).Camilla Peretti, sister of Pope Sixtus, was a great benefactor of the Cistercian nuns, and helped build their residential quarters, including the Chapel of St. Lawrence whose frescoes are the work of Giovan Battista Pozzo (1563-1591).